Pen Settings

HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

Learn more · Versions

Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

Learn more · Versions

CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

Powered by Algolia
About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Powered by Algolia
About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Powered by Algolia
About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                <body>    
  <div id="app" class="loading" data-theme="classic" data-frame="off" data-menu="main">
      <div id="logo">
        <div class="symbol"><div></div><div></div><div></div><div></div><div></div><div></div></div>
        <div class="symbol"><div></div><div></div><div></div><div></div><div></div><div></div></div>
        <div class="symbol"><div></div><div></div><div></div><div></div><div></div><div></div></div>
        <div class="symbol"><div></div><div></div><div></div><div></div><div></div><div></div></div>
        <div class="symbol"><div></div><div></div><div></div><div></div><div></div><div></div></div>
      </div>
      <div id="overlay"></div>
      <div id="menu" class="main">
        <img id ="logoimg" src="https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/logo.png" alt="hartwig chess set" />
        <section id="panes">
          <section id="themes" class="pane">
            <div id="themes-box">
              <div class="set-theme" data-theme="classic"><div class="cube"></div></div>
              <div class="set-theme" data-theme="marble"><div class="cube"></div></div>
              <div class="set-theme" data-theme="flat"><div class="cube"></div></div>
              <div class="set-theme" data-theme="wireframe"><div class="cube"></div></div>
            </div>
            <input type="checkbox" id="frame-switch" onchange="toggleFrame(this)"/>
            <label for="frame-switch" class="btn white switch">Border</label>
            <button type="button" class="btn menu-nav" data-menu="main">Back</button>
          </section>
          <section id="main" class="pane">
            <h1>3D Hartwig chess set</h1>
            <p>done in HTML/CSS/JS by <a href="https://twitter.com/juliangarnier" target="_blank">@JulianGarnier</a></p>
            <button type="button" class="btn white menu-nav" data-menu="themes">Themes
            <button type="button" id="continue" class="btn">Play
            <button type="button" class="btn white menu-nav" data-menu="about">About
          </section>
          <section id="about" class="pane">
            <h1>About</h1>
            <p>Design and code by <a href="https://twitter.com/juliangarnier" target="_blank">@JulianGarnier</a></p>
            <p>Works only in webkit.</p>
            <p>Licensed under the MIT license.</p>
            <p>Fork me on <a href="https://github.com/juliangarnier/3D-Hartwig-chess-set" target="_blanc">Github<a></p>
            <h2>Libraries</h2>
            <p>Lighting effect : <a href="http://photon.attasi.com" target="_blank">Photon</a><br>
              Moves and validation : <a href="https://github.com/jhlywa/chess.js" target="_blank">Chess.js</a></p>
            <button type="button" class="btn menu-nav" data-menu="main">Back</button>
          </section>
        </div>
      <div id="top-bar">
        <button type="button" class="btn icon" data-state="inactive" id="undo"></button>
        <p id="log"></p>
        <button type="button" class="btn icon" id="open-menu"></button>
      </div>
      <div id="container">
        <div id="scene">
          <div id="table">
          <div id="b-jail" class="jail"></div>
          <div id="frame"></div>
        <table id="board">
          <thead>
            <tr>
              <th></th>
              <th><span>a</span></th>
              <th><span>b</span></th>
              <th><span>c</span></th>
              <th><span>d</span></th>
              <th><span>e</span></th>
              <th><span>f</span></th>
              <th><span>g</span></th>
              <th><span>h</span></th>
              <th></th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <th><span>8</span></th>
              <td id="a8" class="square"></td>
              <td id="b8" class="square"></td>
              <td id="c8" class="square"></td>
              <td id="d8" class="square"></td>
              <td id="e8" class="square"></td>
              <td id="f8" class="square"></td>
              <td id="g8" class="square"></td>
              <td id="h8" class="square"></td>
              <th><span>8</span></th>
            </tr>
            <tr>
              <th><span>7</span></th>
              <td id="a7" class="square"></td>
              <td id="b7" class="square"></td>
              <td id="c7" class="square"></td>
              <td id="d7" class="square"></td>
              <td id="e7" class="square"></td>
              <td id="f7" class="square"></td>
              <td id="g7" class="square"></td>
              <td id="h7" class="square"></td>
              <th><span>7</span></th>
            </tr>
            <tr>
              <th><span>6</span></th>
              <td id="a6" class="square"></td>
              <td id="b6" class="square"></td>
              <td id="c6" class="square"></td>
              <td id="d6" class="square"></td>
              <td id="e6" class="square"></td>
              <td id="f6" class="square"></td>
              <td id="g6" class="square"></td>
              <td id="h6" class="square"></td>
              <th><span>6</span></th>
            </tr>
            <tr>
              <th><span>5</span></th>
              <td id="a5" class="square"></td>
              <td id="b5" class="square"></td>
              <td id="c5" class="square"></td>
              <td id="d5" class="square"></td>
              <td id="e5" class="square"></td>
              <td id="f5" class="square"></td>
              <td id="g5" class="square"></td>
              <td id="h5" class="square"></td>
              <th><span>5</span></th>
            </tr>
            <tr>
              <th><span>4</span></th>
              <td id="a4" class="square"></td>
              <td id="b4" class="square"></td>
              <td id="c4" class="square"></td>
              <td id="d4" class="square"></td>
              <td id="e4" class="square"></td>
              <td id="f4" class="square"></td>
              <td id="g4" class="square"></td>
              <td id="h4" class="square"></td>
              <th><span>4</span></th>
            </tr>
            <tr>
              <th><span>3</span></th>
              <td id="a3" class="square"></td>
              <td id="b3" class="square"></td>
              <td id="c3" class="square"></td>
              <td id="d3" class="square"></td>
              <td id="e3" class="square"></td>
              <td id="f3" class="square"></td>
              <td id="g3" class="square"></td>
              <td id="h3" class="square"></td>
              <th><span>3</span></th>
            </tr>
            <tr>
              <th><span>2</span></th>
              <td id="a2" class="square"></td>
              <td id="b2" class="square"></td>
              <td id="c2" class="square"></td>
              <td id="d2" class="square"></td>
              <td id="e2" class="square"></td>
              <td id="f2" class="square"></td>
              <td id="g2" class="square"></td>
              <td id="h2" class="square"></td>
              <th><span>2</span></th>
            </tr>
            <tr>
              <th><span>1</span></th>
              <td id="a1" class="square"></td>
              <td id="b1" class="square"></td>
              <td id="c1" class="square"></td>
              <td id="d1" class="square"></td>
              <td id="e1" class="square"></td>
              <td id="f1" class="square"></td>
              <td id="g1" class="square"></td>
              <td id="h1" class="square"></td>
              <th><span>1</span></th>
            </div>
          </tbody>
          <tfoot>
            <tr>
              <th></th>
              <th><span>a</span></th>
              <th><span>b</span></th>
              <th><span>c</span></th>
              <th><span>d</span></th>
              <th><span>e</span></th>
              <th><span>f</span></th>
              <th><span>g</span></th>
              <th><span>h</span></th>
              <th></th>
            </tr>
          </tfoot>
        </table>
          <div id="w-jail" class="jail"></div>
        </div>
        <div id="pieces">
          <div id="p" class="piece pawn">
            <div class="poly-group">
              <div class="poly small-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
          </div>
          <div id="r" class="piece rook">
            <div class="poly-group">
              <div class="poly big-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
          </div>
          <div id="n" class="piece knight">
            <div class="poly-group bottom">
              <div class="poly a">
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
              </div>
              <div class="poly b">
                <div class="ft face"></div>
                <div class="tp face"></div>
              </div>
              <div class="poly c">
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
              </div>
            </div>
            <div class="poly-group top">
              <div class="poly a">
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
              <div class="poly b">
                <div class="ft face"></div>
                <div class="tp face"></div>
              </div>
              <div class="poly c">
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
              </div>
            </div>
          </div>
          <div id="b" class="piece bishop">
            <div class="poly-group rectangle a">
              <div class="poly">
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
            <div class="poly-group rectangle b">
              <div class="poly">
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
            <div class="poly-group rectangle b prim">
              <div class="poly">
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
            <div class="poly-group corners a">
              <div class="poly big-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
              </div>
            </div>
            <div class="poly-group corners b">
              <div class="poly big-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
              </div>
            </div>
          </div>
          <div id="q" class="piece queen">
            <div class="poly-group bottom">
              <div class="poly big-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
            <div class="poly-group top">
              <div class="poly">
                <div class="sphere"></div>
              </div>
            </div>
          </div>
          <div id="k" class="piece king">
            <div class="poly-group bottom">
              <div class="poly big-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
            <div class="poly-group top">
              <div class="poly small-cube">
                <div class="ft face"></div>
                <div class="bk face"></div>
                <div class="rt face"></div>
                <div class="lt face"></div>
                <div class="tp face"></div>
              </div>
            </div>
          </div>
          </div>
        </div>
        <div id="promotion"></div>
      </div>     
    </div>
</body>
!

CSS 

              
                /*
          BEST VIEWED IN FULL SCREEN :
  
   ==========================================
   https://codepen.io/juliangarnier/full/BsIih
   ==========================================
  
*/

@import url(https://fonts.googleapis.com/css?family=Lato:400,900);

* { box-sizing: border-box; tap-highlight-color:rgba(0,0,0,0); }

body { 
  position: absolute;
  width: 100%;
  height: 100%;
  font-size: 100%;
  overflow: hidden;
  font-family: avenir, 'Lato', sans-serif;
  font-weight: 400;
}

button { 
  font-family: avenir, 'Lato', sans-serif;
  font-weight: 400;
}

body:not(.animated) *:not(#panes) { transition: all 0s linear; }

#app {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: black; 
  color: white;
}

#app a { color: #EAEAEA; }

#container,
#board,
#frame {
  position: absolute;
  left: 50%;
  top: 50%;
  transform-style: preserve-3d;
}

#app[data-frame="off"] #board,
#app[data-frame="off"] #board #container,
#app[data-frame="off"] #frame {
  width: 8em;
  height: 8em;
  margin: -4em 0 0 -4em;
}

#app[data-frame="on"] #container,
#app[data-frame="on"] #board,
#app[data-frame="on"] #frame {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 9.5em;
  height: 9.5em;
  margin: -4.75em 0 0 -4.75em;
  transform-style: preserve-3d;
}

#container {
  z-index: 1;
  perspective: 800px;
  transform: translateZ( 1000px );
}

#app[data-state="game"] #container { transform: translateZ( 1000px ); }

#scene { 
  position: absolute;
  left: 50%;
  top: 50%;
  width: 16em;
  height: 16em;
  margin: -8em 0 0 -8em;
  transform-style: preserve-3d;
  transform: rotateX( 90deg ) rotateZ( 90deg );
}

.sphere { transform: rotateZ( -90deg ) rotateX( -90deg ); }

#scene, .sphere { transition: transform 2s ease-in-out; }

#app[data-state="game"] #scene,
#app[data-state="game"] .sphere { transition-delay: .2s; }

#pieces {
  visibility: hidden;
  position: absolute;
  left: 0;
  top: 0;
}

#board {
  z-index: 0;
  transform: translateZ(.3em);
}

#board:after, #frame:after, #frame:before { 
  position: absolute;
  content: "";
  width: 100%;
  height: .3em;
  transform-style: preserve-3d;
  box-sizing: border-box;
}

#frame {
  z-index: -1;
  transform-style: preserve-3d;
  transform: translateZ(.02em) rotateZ(90deg);
  box-shadow: 0 0 .25em .1em rgba(0,0,0,.5);
}

#app[data-frame="on"] #board:after    { transform: rotateX(90deg) translateZ(8.75em) translateY(-0.3em);
                                        transform-origin: 0 0; }
#app[data-frame="on"] #frame:after    { transform: rotateX(90deg) rotateY(90deg) translateX(9.5em) translateY(-0.02em);
                                        transform-origin: 100% 0; }
#app[data-frame="on"] #frame:before   { transform: rotateX(90deg) rotateY(0deg) translateX(0em) translateY(-0.02em);
                                        transform-origin: 100% 0; }

#app[data-frame="off"] th             { display: none; }

#app[data-frame="off"] #board:after   { transform: rotateX(90deg) translateZ(8em) translateY(-0.3em);
                                        transform-origin: 0 0; }
#app[data-frame="off"] #frame:after   { transform: rotateX(90deg) rotateY(90deg) translateX(8em) translateY(-0.02em);
                                        transform-origin: 100% 0; }
#app[data-frame="off"] #frame:before  { transform: rotateX(90deg) rotateY(0deg) translateX(0em) translateY(-0.02em);
                                        transform-origin: 100% 0; }

th, td {
  position: relative;
  width: 1em;
  height: 1em;
}

th { 
  vertical-align: top; 
  font-size: 75%; 
  line-height: .5em;
}

tbody th {
  vertical-align: top;  
  line-height: .9em;
}

table span { 
  display: block;
  height: 100%;
  font-size: .26em; 
  color: rgba(255,255,255,.75); 
  transform: translateZ(1px);
}

thead span, tbody th:last-child span{
  transform: rotateZ(180deg) translateZ(1px);
  transform-origin: center;
}

thead span, tfoot span { line-height: 3.9em; }
tbody span { line-height: 4.5em; padding-right: 0.3em; }

/* ---------------------------------------------------------------------------------------------------- jail */

.jail {
  position: absolute;
  left: 50%;
  width: 8em;
  height: 2.25em;
}

#app[data-frame="off"] #w-jail { bottom: 1.5em;   margin-left: -4em; }
#app[data-frame="off"] #b-jail { top: 1.5em;      margin-left: -4em; }

#app[data-frame="on"] #w-jail { bottom: 1em;      margin-left: -4em; }
#app[data-frame="on"] #b-jail { top: 1em;         margin-left: -4em; }

#w-jail { 
  bottom: 1em;
  transform-style: preserve-3d;
  transform: rotateZ(0deg) translateZ(2px);
}

#b-jail { 
  top: 1em;
  transform-style: preserve-3d;
  transform: rotateZ(180deg) translateZ(2px);
}

.jail .piece{
  position: relative;
  float: left;
}

.jail .piece .face, .jail .piece .sphere, {
  box-shadow: inset 10em 10em 1em rgba(0, 0, 0, .3);
}

#b-jail .piece { transform-origin: center; transform: rotateZ(180deg); }
#w-jail .piece { transform-origin: center; transform: rotateZ(0deg);}

@media screen and (min-width: 56em) { 

  #app[data-frame="off"] #w-jail { bottom: 6.9em;   margin-left: 1.5em; }
  #app[data-frame="off"] #b-jail { top: 6.9em;      margin-left: -9.5em; }

  #app[data-frame="on"] #w-jail { bottom: 6.9em;    margin-left: 2em; }
  #app[data-frame="on"] #b-jail { top: 6.9em;       margin-left: -10em; }

  #b-jail { transform: rotateZ(90deg) translateZ(2px); }
  #w-jail { transform: rotateZ(-90deg) translateZ(2px); }

  #b-jail .piece { transform: rotateZ(-90deg); }
  #w-jail .piece { transform: rotateZ(90deg); }

}

/* ---------------------------------------------------------------------------------------------------- piece */

.piece {
  position: absolute;
  width: 1em;
  height: 1em;
  transform-style: preserve-3d;
  transform-origin: 4em;
  transform: translateZ( 2px );
}

.piece,
.poly, 
.poly .face,  
.poly-group:first-child, 
.bishop .poly-group:nth-child(2) {
  transition: transform .2s linear;
}

.piece:active {
  cursor: grabbing;
  cursor: -moz-grabbing;
  cursor: grabbing;
}

.piece.grabbed {
  transition: all 0s linear;
  z-index: 9999;
}

.poly-group {
  position: absolute;
  left: 50%;
  top: 50%;
  font-size: 10%;
  transform-style: preserve-3d;
}

.poly-group:first-child {
  background: rgba(0,0,0,.4);
  box-shadow: 0 0 1em .2em rgba(0,0,0,.6);
}

.bishop .poly-group:nth-child(2) {
  background: rgba(0,0,0,.4);
  box-shadow: 0 0 1em .2em rgba(0,0,0,.6);
}

.piece:active .poly, .piece.grabbed .poly{
  transform: translateZ( 10em );
}

.piece.grabbed .poly-group:first-child {
  background: rgba(0,0,0,.6);
  box-shadow: 0 0 1em .8em rgba(0,0,0,.6);
}

.piece.grabbed.bishop .poly-group:nth-child(2) {
  background: rgba(0,0,0,.6);
  box-shadow: 0 0 1em .8em rgba(0,0,0,.6);
}

.poly {
  position: absolute;
  transform-style: preserve-3d;
}

.poly .face {
  position: absolute;
  transform-origin: 0 0;
}

.valid:before,
.valid:after,
.current:before,
.current:after,
.castle:before,
.castle:after,
.valid.highlight:before,
.valid.highlight:after,
.current.highlight:before,
.current.highlight:after {
  content: '';
  z-index: 1;
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  transform-style: preserve-3d;
  -moz-box-sizing: border-box; box-sizing: border-box; box-sizing: border-box;
  transform: translateZ( 1px );
}

.valid:before, .current:before { 
  width: .3em;
  height: .3em;
  margin-left: -.15em;
  margin-top: -.15em;
  background: rgba(255,255,255,.5);
}

.highlight:before { 
  z-index: 2;
  box-shadow: 0 0 1em 1em rgba(255,255,255,.4);
}

.valid.highlight:before, 
.current.highlight:before, 
.current:before { background: rgba(255,255,255,1); }

.valid.highlight:after,
.current.highlight:after { 
  width: .6em;
  height: .6em;
  margin-left: -.3em;
  margin-top: -.3em;
  border: .1em solid rgba(255,255,255,.8);
}

.valid.captured:after { 
  width: .8em;
  height: .8em;
  margin-left: -.4em;
  margin-top: -.4em;
  border: .1em solid rgba(255,255,255,.6);
}

.valid:before { background: rgba(255,255,255,.35); }
.valid:after { border: none; }

.valid.highlight:before { background: rgba(255,255,255,1); }
.valid.highlight:after { border: .1em solid rgba(255,255,255,.35); }

.valid.captured:before { background: rgba(255,67,47,.5); }
.valid.captured:after { border: .1em solid rgba(255,67,47,.5); }

.valid.captured.highlight:before { background: rgba(255,67,47,1); }
.valid.captured.highlight:after { border: .1em solid rgba(255,67,47,1); }

.valid[class*="O-O"]:before { background: #CC0; }
.valid[class*="O-O"]:after { border: .1em solid #CC0; }

/* ---------------------------------------------------------------------------------------------------- pawn / king head */

.pawn .poly-group {
  width: 4em;
  height: 4em;
  margin: -2em 0 0 -2em;
}

.poly.small-cube {
  width: 4em;
  height: 4em;
}

.small-cube .tp {
  width: 4em;
  height: 4em;
  transform: translateZ( 4em );
}

.small-cube .ft  {
  width: 4em;
  height: 4em;
  transform: rotateX(90deg) translateZ(-4em);
}

.small-cube .bk   {
  width: 4em;
  height: 4em;
  transform: rotateX(90deg);
}

.small-cube .rt {
  width: 4em;
  height: 4em;
  transform: rotateY(90deg) translateX(-4em);
}

.small-cube .lt {
  width: 4em;
  height: 4em;
  transform: rotateY(90deg) translateX(-4em) translateZ(4em);
}

/* ---------------------------------------------------------------------------------------------------- rook / queen and king bodies */ 

.rook .poly-group {
  width: 6em;
  height: 6em;
  margin: -3em 0 0 -3em;
}

.poly.big-cube {
  width: 6em;
  height: 6em;
}

.big-cube .tp {
  width: 6em;
  height: 6em;
  transform: translateZ( 6em );
}

.big-cube .ft  {
  width: 6em;
  height: 6em;
  transform: rotateX(90deg) translateZ(-6em);
}

.big-cube .bk   {
  width: 6em;
  height: 6em;
  transform: rotateX(90deg);
}

.big-cube .rt {
  width: 6em;
  height: 6em;
  transform: rotateY(90deg) translateX(-6em);
}

.big-cube .lt {
  width: 6em;
  height: 6em;
  transform: rotateY(90deg) translateX(-6em) translateZ(6em);
}

/* ---------------------------------------------------------------------------------------------------- knight */ 

.knight .poly-group {
  width: 6em;
  height: 6em;
  margin: -3em 0 0 -3em;
}

.knight .poly-group.top { transform: translateZ( 3em ) rotateZ( 180deg ); }

.knight .poly.a { margin: 0; }
.knight .poly.b { margin: 3em 0 0 0; }
.knight .poly.c { margin: 3em 0 0 3em; }

.knight .tp {
  width: 3em;
  height: 3em;
  transform: translateZ( 3em );
}
.knight .bm {
  width: 8em;
  height: 8em;
  transform: translateZ( 0em );
}
.knight .ft  {
  width: 3em;
  height: 3em;
  transform: rotateX(90deg) translateZ(-3em);
}
.knight .bk   {
  width: 3em;
  height: 3em;
  transform: rotateX(90deg);
}
.knight .rt {
  width: 3em;
  height: 3em;
  transform: rotateY(90deg) translateX(-3em);
}
.knight .lt {
  width: 3em;
  height: 3em;
  transform: rotateY(90deg) translateX(-3em) translateZ(3em);
}

.knight .poly.a .rt { height: 6em; }
.knight .poly.b .ft { width: 6em; }
.knight .poly.b .tp { width: 6em; }

.knight .bottom .poly.b .tp { box-shadow: inset -3.6em .7em 2em rgba(0, 0, 0, .7); }

/* ---------------------------------------------------------------------------------------------------- bishop */

.bishop .rectangle {
  width: 2em;
  height: 6.6em;
  margin: -3.3em 0 0 -1em;
}

.bishop .rectangle.a { transform: rotateZ( 45deg ); }
.bishop .rectangle.b { transform: rotateZ( -45deg ); }

.bishop .rectangle.a .tp {
  position: relative;
  width: 2em;
  height: 6.6em;
  transform: translateZ(6em);
}

.bishop .rectangle.a .rt {
  width: 6em;
  height: 6.6em;
  transform: rotateY(90deg) translateX(-6em) translateZ(0em);
}

.bishop .rectangle.a .lt {
  width: 6em;
  height: 6.6em;
  transform: rotateY(90deg) translateX(-6em) translateZ(2em);
}

.bishop .rectangle.a .tp:before, .bishop .rectangle.b .tp:before {
  content: "";
  position: absolute;
  top: -1em;
  width: 0; 
  height: 0; 
  border-left: 1.1em solid transparent;
  border-right: 1.1em solid transparent;
  border-bottom: 1.1em solid #fff;
}

.bishop .rectangle.b.prim .tp:before { border: none; }

.bishop .rectangle.a .tp:after, .bishop .rectangle.b.prim .tp:after {
  content: "";
  position: absolute;
  bottom: -1em;
  width: 0; 
  height: 0; 
  border-left: 1.1em solid transparent;
  border-right: 1.1em solid transparent;
  border-top: 1.1em solid #fff;
}

.bishop .rectangle.b .tp {
  position: relative;
  width: 2em;
  height: 2.3em;
  transform: translateZ(6em);
}

.bishop .rectangle.b .rt {
  width: 6em;
  height: 2.3em;
  transform: rotateY(90deg) translateX(-6em);
}

.bishop .rectangle.b .lt {
  width: 6em;
  height: 2.3em;
  transform: rotateY(90deg) translateX(-6em) translateZ(2em);
}

.bishop .rectangle.b.prim .tp { transform: translateZ(6em) translateY(4.3em); }
.bishop .rectangle.b.prim .rt { transform: rotateY(90deg) translateX(-6em) translateY(4.3em); }
.bishop .rectangle.b.prim .lt { transform: rotateY(90deg) translateX(-6em) translateZ(2em) translateY(4.3em); }

.bishop .corners.a { transform: rotateZ( 0deg ); }
.bishop .corners.b { transform: rotateZ( 180deg ); }

.bishop .big-cube { margin: -3em 0 0 -3em; }
.bishop .big-cube .ft { width: 1.5em; }
.bishop .big-cube .lt { height: 1.5em; }
.bishop .big-cube .bk { width: 1.5em; }
.bishop .big-cube .rt { height: 1.5em; }

.bishop .tp { box-shadow: 0 0 0 #fff; }

/* ---------------------------------------------------------------------------------------------------- queen */ 

.queen .poly-group:first-child {
  width: 6em;
  height: 6em;
  margin: -3em 0 0 -3em;
}

.queen .top { transform: translateZ(8.5em); }

.queen .bottom .tp:before {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1em;
  height: 1em;
  margin: -.5em 0 0 -.5em;
  background: rgba(0,0,0,.6);
  border-radius: 50%;
  transform: rotateX( -35.3deg ) rotateY(0deg);
  box-shadow: 0 0 1em 2em rgba(0,0,0,.6);
}

.poly div.sphere {
  position: absolute;
  left: 50%;
  width: 5em;
  height: 5em;
  margin: -2.5em 0 0 -2.5em;
  border-radius: 50%;
  transform-origin: 2.5em 2.5em;
}

/* ---------------------------------------------------------------------------------------------------- king */ 

.king .poly-group:first-child {
  width: 6em;
  height: 6em;
  margin: -3em 0 0 -3em;
}

.king .top { transform: rotateZ(-45deg) translateZ(6em); }

.king .top .small-cube { margin: -2em 0 0 -2em; }

/* ---------------------------------------------------------------------------------------------------- pieces initial positions */

#p { transform: translateX( -1em ) translateY( 7em ); }
#r { transform: translateX( -1em ) translateY( 6em ); }
#n { transform: translateX( -1em ) translateY( 5em ); }
#b { transform: translateX( -1em ) translateY( 4em ); }
#q { transform: translateX( -1em ) translateY( 3em ); }
#k { transform: translateX( -1em ) translateY( 2em ); }

/* ------------------------------------------------------- UI elements */

h1 {
  margin-bottom: .5em;
  font-size: 1.75em;
  font-weight: 900;
  text-transform: uppercase;
}

h2 {
  margin-top: .75em;
  margin-bottom: .5em;
  font-size: 1em;
  font-weight: 900;
  text-transform: uppercase;
}

#menu, #top-bar {
  z-index: 100;
  font-size: 16px;
  text-align: center;
}

#menu {
  opacity: 0;
  position: absolute;
  left: 50%;
  width: 24em;
  height: 9em;
  margin: 0 0 0 -12em;
  transition-delay: 0;
  transition: all 1.5s ease-in-out;
  transform: translateY(-24em) translateZ(99999px);
}

#app[data-state="menu"] #menu {
  opacity: 1;
  transition-delay: 1.5s;
  transform: translateY(0em) translateZ(99999px);
}

#logoimg {
  margin: 3em 0 1em 0;
}

#logo {
  z-index: 100;
  position: absolute;
  left: 50%;
  top: 50%;
  width: 20em;
  height: 4em;
  margin-left: -10em;
  margin-top: -4em;
  font-size: 16px;
  transform: translateZ(9999px);
  perspective: 800;
  transition: top 1.5s ease-in-out;
}

#app[data-state="game"] #logo {
  transform: translateZ(9999px) translateY(-40em);
}

.symbol {
  position: relative;
  float: left;
  width: 4em;
  height: 4em;
  transition : transform 2s linear;
  transform-style : preserve-3d;
  transform-origin : 2em 2em;
  transition: all 1.5s ease-in-out;
  animation : fall 2s 1 ease-in-out;
}

.loading .symbol { 
  top: 0;
  animation : rotateX 2s 1 ease-in-out;
}

.symbol:nth-child(1) { z-index: 1; animation-delay: 400ms; }
.symbol:nth-child(2) { z-index: 2; animation-delay: 500ms; }
.symbol:nth-child(3) { z-index: 3; animation-delay: 600ms; }
.symbol:nth-child(4) { z-index: 2; animation-delay: 700ms; }
.symbol:nth-child(5) { z-index: 1; animation-delay: 800ms; }

@keyframes rotateX {
  0%   { transform: rotateX(0deg); }
  100% { transform: rotateX(360deg); }
}

@keyframes fall {
  0%   { transform: rotateX(0deg) translateY(0em); opacity: 1; }
  100% { transform: rotateX(120deg) translateY(60em); opacity: 0; }
}

.symbol > div {
  position: absolute;
  width: 4em;
  height: 4em;
  transform-style: preserve-3d;
  background-color : white;
}

.symbol div:nth-child(1) { transform : translateZ(2em); }
.symbol div:nth-child(2) { transform : rotateY(90deg) translateZ(2em); background-color : #A0A0A0; }
.symbol div:nth-child(3) { transform : rotateY(180deg) translateZ(2em); background-color : #D0D0D0; }
.symbol div:nth-child(4) { transform : rotateY(-90deg) translateZ(2em); background-color : #A0A0A0; }
.symbol div:nth-child(5) { transform : rotateX(-90deg) translateZ(2em) rotate(180deg); background-color: #E0E0E0; }
.symbol div:nth-child(6) { transform : rotateX(90deg) translateZ(2em); background-color : #C0C0C0; }

.symbol > div:first-child {
  background-color: #101010;
  border: .25em solid white;
}

.symbol > div:first-child:before,
.symbol > div:first-child:after {
  content: "";
  position: absolute;
}

.symbol:nth-child(1) > div:first-child:before {
  top: .55em;
  left: .55em;
  width: 2.45em;
  height: 2.45em;
  transform: rotateZ(45deg);
  background-color: white;
}

.symbol:nth-child(2) > div:first-child:before {
  top: .05em;
  left: .05em;
  width: 2.5em;
  height: 2.5em;
  background-color: #101010;
  border-radius: 50%;
  border: .45em solid white;
}

.symbol:nth-child(3) > div:first-child {
  background-color: white;
  overflow: hidden;
}

.symbol:nth-child(3) > div:first-child:before,
.symbol:nth-child(3) > div:first-child:after {
  left: 1em;
  width: 1em;
  height: 6em;
  background-color: #101010;
}

.symbol:nth-child(3) > div:first-child:before {
  top: -1em;
  transform: rotateZ(45deg);
}

.symbol:nth-child(3) > div:first-child:after {
  top: -1.5em;
  -webkit-transform: rotateZ(-45deg);
}

.symbol:nth-child(4) > div:first-child:before {
  right: 0;
  bottom: 0;
  width: 1.75em;
  height: 1.75em;
  background-color: white;
}

#panes {
  width: 72em;
  transition: transform .75s ease-in-out;
}

.pane {
  opacity: 0;
  width: 24em;
  height: 8em;
  position: absolute;
  background-color: transparent;
  transition: opacity .45s ease-in-out!important;
}

.pane:nth-child(1) { transform: translateX(-80em); }
.pane:nth-child(2) { transform: translateX(0em); }
.pane:nth-child(3) { transform: translateX(80em); }

#app[data-menu="themes"] #panes { transform: translateX(80em); }
#app[data-menu="main"] #panes   { transform: translateX(0em); }
#app[data-menu="about"] #panes { transform: translateX(-80em); }

#app[data-menu="main"] #main,
#app[data-menu="themes"] #themes,
#app[data-menu="about"] #about {
  opacity: 1;
}

#top-bar {
  opacity: 0;
  position: relative;
  width: 100%;
  max-width: 46em;
  height: 2em;
  margin: 0 auto;
  transform: translateY(-3em);
  transition: all 1.5s ease-in-out;
  transition-delay: 0s;
}

#app[data-state="game"] #top-bar {
  opacity: 1;
  transform: translateY(1em);
  transition-delay: 1s;
}

.btn {
  display: inline-block;
  height: 2em;
  border: none;
  color: white;
  font-size: 1em;
  line-height: 1.75em;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  text-transform: uppercase;
  background-color: #303030;
  transform: translateZ(1em);
  transition: background-color .1s ease-out!important;
}

.btn.white {
  color: black;
  background-color: white;
}

.btn:hover,
.btn:active { background-color: #5A5A5A; cursor: pointer; }

.btn.white:hover,
.btn.white:active { background-color: #CACACA; }

#menu .btn { 
  width: 6em; 
  margin: 1em 0em; 
}

#top-bar .btn {
  width: 4em;
  height: 3em;
  padding: 0;
  background-color: rgba(255,255,255,.01);
}

#undo { float: left; }
#open-menu { float: right; }
#undo:before  { background-position: 0 0; }
#open-menu:before  { background-position: -20px 0; }

#undo[data-state="inactive"] { display: none; }

#log {
  position: absolute;
  left: 50%;
  width: 24em;
  height: 3em;
  margin-left: -12em;
  color: #808080;
  text-align: center;
  line-height: 3em;
}

.btn.icon { background-color: rgba(255, 255, 255, 0); }

.btn.icon:before {
  content: "";
  width: 20px;
  height: 16px;
  display: inline-block;
  background-image: url("https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/icons.png");
  background-repeat: no-repeat;
  background-size: 40px 16px;
}

#themes .btn { width: 8em; }

#menu .switch {
  line-height: 2em;
  margin-right: 1em;
  transition: none!important;
}

#menu .switch:hover {
  background-color: #CACACA;
}

input[type=checkbox] {
  display:none;
}

input[type=checkbox] + label:after {
  content: "off";
  float: right;
  display: block;
  width: 3em;
  height: 2em;
  background-color: #999;
  line-height: 2em;
  text-align: center;
  color: #FFF;
  transition: none!important;
}

input[type=checkbox]:checked + label:after {
  content: "on";
  background-color: #333;
  color: #FFF;
}

input[type=checkbox]:hover + label:after {
  color: #FFF;
  background-color: #666;
}

#themes-box {
  width: 19em;
  height: 3.5em;
  margin: 0 2.6em;
}

.set-theme {
  float: left;
  width: 3.375em;
  height: 3.375em;
  position: relative;
  margin: 0 .65em;
}

.set-theme:hover { cursor: pointer; background: rgba(255,255,255,.3); }
.set-theme:hover .cube, 
.set-theme:active .cube { transform: rotateX(146deg) rotateY(45deg) translateY(0.1em) translateX(3em); }
#app[data-theme="classic"] .set-theme[data-theme="classic"],
#app[data-theme="marble"] .set-theme[data-theme="marble"],
#app[data-theme="flat"] .set-theme[data-theme="flat"],
#app[data-theme="wireframe"] .set-theme[data-theme="wireframe"] { 
  background: rgba(255,255,255,1);
}

.cube,
.cube:before,
.cube:after {
  content: "";
  width: 2em;
  height: 2em;
  background-color: #A0A0A0;
  background-size: 235%;
  transition: transform .1s ease-in-out!important;
  box-sizing: border-box;
}

.cube {
  position: relative;
  margin-left: -2.15em;
  box-shadow: inset 0 0 0 3em rgba(0,0,0,.2);
  transform: rotateX(156deg) rotateY(45deg) translateY(-.15em) translateX(3em);
  transform-style: preserve-3d;
}

.cube:before {
  position: absolute;
  left: 0;
  top: 2em;
  transform: rotateX(90deg);
  transform-origin: 0 0;
}

.cube:after {
  position: absolute;
  left: 0;
  bottom: 0;
  box-shadow: inset 0 0 0 3em rgba(0,0,0,.5);
  transform: rotateY(90deg);
  transform-origin: 100% 0;
}

#overlay {
  z-index: 2;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: black;
  opacity: 0;
  transition: opacity 1.5s ease-in-out!important;
  transform: translateZ(9999px);
}

.loading #overlay { 
  opacity: 1; 
  background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/ajax-loader.gif);
  background-position: 50% 60%;
  background-repeat: no-repeat;
}

#app[data-menu="about"] #overlay {
  z-index: 99;
  opacity: .75;
}

#app[data-state="game"] #overlay {
  width: 0%;
  height: 0%;
}

#about p { line-height: 1.5em; }

/* ---------------------------------------------------------------------------------------------------- borders textures */

thead th:first-child  { background-position: left top; background-size: 332% auto; }
thead th              { background-position: center top; background-size: 250% auto; }
thead th:last-child   { background-position: right top; background-size: 332% auto; }
tbody th:first-child  { background-position: left center; background-size: auto 250%; }
tbody th:last-child   { background-position: right center; background-size: auto 250%; }
tfoot th:first-child  { background-position: left bottom; background-size: 332% auto; }
tfoot th              { background-position: center bottom; background-size: 250% auto; }
tfoot th:last-child   { background-position: right bottom; background-size: 332% auto; }

.square, .sphere, #board:after, #frame:after, #frame:before { background-size: 100% 100%; }

/* ---------------------------------------------------------------------------------------------------- classic */

#app[data-theme="classic"]                                            { background-color: #E5E3DF; color: #303132; }
#app[data-theme="classic"] a                                          { color: #404040; }
#app[data-theme="classic"] #overlay                                   { background-color: #E5E3DF; }
#app[data-theme="classic"] #scene                                     { background: radial-gradient(center, ellipse cover, #FFF 25%, #E5E3DF 72%); }
#app[data-theme="classic"][data-frame="off"] #frame,
#app[data-theme="classic"][data-frame="off"] #board:after, 
#app[data-theme="classic"][data-frame="off"] #frame:after, 
#app[data-theme="classic"][data-frame="off"] #frame:before            { background-color: #A28157; }
#app[data-theme="classic"][data-frame="on"]  #frame,
#app[data-theme="classic"][data-frame="on"]  #board:after, 
#app[data-theme="classic"][data-frame="on"]  #frame:after, 
#app[data-theme="classic"][data-frame="on"]  #frame:before            { background-color: #303132; }
#app[data-theme="classic"] .square                                    { background-color: #212121; }
#app[data-theme="classic"] tbody tr:nth-child(odd) 
                           .square:nth-child(even), 
#app[data-theme="classic"] tbody tr:nth-child(even) 
                          .square:nth-child(odd)                      { background-color: #CF9269; }
#app[data-theme="classic"] .black .poly > div, 
#app[data-theme="classic"] .black .poly .sphere                       { background-color: #303030; }
#app[data-theme="classic"] .white .poly > div,
#app[data-theme="classic"] .white .poly .sphere                       { background-color: #C19666; }
#app[data-theme="classic"] .white.bishop .rectangle.a .tp:before, 
#app[data-theme="classic"] .white.bishop .rectangle.b .tp:before      { border-bottom: 1.1em solid #F2BD7D; }
#app[data-theme="classic"] .white.bishop .rectangle.a .tp:after, 
#app[data-theme="classic"] .white.bishop .rectangle.b.prim .tp:after  { border-top: 1.1em solid #F2BD7D; }
#app[data-theme="classic"] .black.bishop .rectangle.a .tp:before, 
#app[data-theme="classic"] .black.bishop .rectangle.b .tp:before      { border-bottom: 1.1em solid #434343; }
#app[data-theme="classic"] .black.bishop .rectangle.a .tp:after, 
#app[data-theme="classic"] .black.bishop .rectangle.b.prim .tp:after  { border-top: 1.1em solid #434343; }

/* ---------------------------------------------------------------------------------------------------- classic textures */

#app[data-theme="classic"] th                       { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-frame.png); }
#app[data-theme="classic"][data-frame="off"] #board:after, 
#app[data-theme="classic"][data-frame="off"] #frame:after, 
#app[data-theme="classic"][data-frame="off"] #frame:before 
                                                    { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-frame-border-off.png); }
#app[data-theme="classic"][data-frame="on"] #board:after, 
#app[data-theme="classic"][data-frame="on"] #frame:after, 
#app[data-theme="classic"][data-frame="on"] #frame:before  
                                                    { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-frame-border.png); }
#app[data-theme="classic"] .square                  { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-square-black.png) }
#app[data-theme="classic"] .white .poly > div,
.set-theme[data-theme="classic"] .cube,
.set-theme[data-theme="classic"] .cube:before,
.set-theme[data-theme="classic"] .cube:after        { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-piece-white.png); }
#app[data-theme="classic"] .black .poly > div       { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-piece-black.png); }
#app[data-theme="classic"] .white .poly .sphere     { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-sphere-white.png); }
#app[data-theme="classic"] .black .poly .sphere     { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-sphere-black.png); }

#app[data-theme="classic"] tbody tr:nth-child(odd)
                           .square:nth-child(even), 
#app[data-theme="classic"] tbody tr:nth-child(even)
                           .square:nth-child(odd)   { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/classic-square-white.png); }

/* ---------------------------------------------------------------------------------------------------- marble */

#app[data-theme="marble"] th                                          { background-color: #303030; }
#app[data-theme="marble"][data-frame="off"] #frame,
#app[data-theme="marble"][data-frame="off"] #board:after, 
#app[data-theme="marble"][data-frame="off"] #frame:after, 
#app[data-theme="marble"][data-frame="off"] #frame:before             { background-color: #B0B0B0; }
#app[data-theme="marble"][data-frame="on"]  #frame,
#app[data-theme="marble"][data-frame="on"]  #board:after, 
#app[data-theme="marble"][data-frame="on"]  #frame:after, 
#app[data-theme="marble"][data-frame="on"]  #frame:before             { background-color: #202020; }
#app[data-theme="marble"] .square                                     { background-color: #404040; }
#app[data-theme="marble"] tbody tr:nth-child(odd) 
                           .square:nth-child(even), 
#app[data-theme="marble"] tbody tr:nth-child(even) 
                          .square:nth-child(odd)                      { background-color: #FFF; }
#app[data-theme="marble"] .black .poly > div, 
#app[data-theme="marble"] .black .poly .sphere                        { background-color: #404040; }
#app[data-theme="marble"] .white .poly > div,
#app[data-theme="marble"] .white .poly .sphere                        { background-color: #FFF; }
#app[data-theme="marble"] .white.bishop .rectangle.a .tp:before, 
#app[data-theme="marble"] .white.bishop .rectangle.b .tp:before       { border-bottom: 1.1em solid #EAE5E0; }
#app[data-theme="marble"] .white.bishop .rectangle.a .tp:after, 
#app[data-theme="marble"] .white.bishop .rectangle.b.prim .tp:after   { border-top: 1.1em solid #EAE5E0; }
#app[data-theme="marble"] .black.bishop .rectangle.a .tp:before, 
#app[data-theme="marble"] .black.bishop .rectangle.b .tp:before       { border-bottom: 1.1em solid #565453; }
#app[data-theme="marble"] .black.bishop .rectangle.a .tp:after, 
#app[data-theme="marble"] .black.bishop .rectangle.b.prim .tp:after   { border-top: 1.1em solid #565453; }

/* ---------------------------------------------------------------------------------------------------- marble textures */

#app[data-theme="marble"] #scene                    { background: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/back.jpg) no-repeat center center black; background-size: cover;}
#app[data-theme="marble"] th                        { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-frame.png); }
#app[data-theme="marble"][data-frame="off"] #board:after, 
#app[data-theme="marble"][data-frame="off"] #frame:after, 
#app[data-theme="marble"][data-frame="off"] #frame:before 
                                                    { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-frame-border-off.png); }
#app[data-theme="marble"][data-frame="on"] #board:after, 
#app[data-theme="marble"][data-frame="on"] #frame:after, 
#app[data-theme="marble"][data-frame="on"] #frame:before  
                                                    { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-frame-border.png); }
#app[data-theme="marble"] .square                   { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-square-black.png) }
#app[data-theme="marble"] .white .poly > div,
.set-theme[data-theme="marble"] .cube,
.set-theme[data-theme="marble"] .cube:before,
.set-theme[data-theme="marble"] .cube:after         { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-piece-white.png); }
#app[data-theme="marble"] .black .poly > div        { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-piece-black.png); }
#app[data-theme="marble"] .white .poly .sphere      { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-sphere-white.png); }
#app[data-theme="marble"] .black .poly .sphere      { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-sphere-black.png); }
#app[data-theme="marble"] tbody tr:nth-child(odd)
                        .square:nth-child(even), 
#app[data-theme="marble"] tbody tr:nth-child(even)
                        .square:nth-child(odd)      { background-image: url(https://raw.github.com/juliangarnier/3D-Hartwig-chess-set/master/img/marble-square-white.png); }

/* ---------------------------------------------------------------------------------------------------- flat */

#app[data-theme="flat"]                             { background-color: #E5E3DF; color: #303132; }
#app[data-theme="flat"] a                           { color: #404040; }
#app[data-theme="flat"] #overlay                    { background-color: #E5E3DF; }
#app[data-theme="flat"] #scene                      { background: radial-gradient(center, ellipse cover, #FFF 25%, #E5E3DF 72%); }
#app[data-theme="flat"] #frame,
#app[data-theme="flat"] #board:after, 
#app[data-theme="flat"] #frame:after, 
#app[data-theme="flat"] #frame:before               { background-color: #B7B7B4; }
#app[data-theme="flat"] .square                     { background-color: #C6C5C3; }
#app[data-theme="flat"] tbody tr:nth-child(odd) .square:nth-child(even), 
#app[data-theme="flat"] tbody tr:nth-child(even) .square:nth-child(odd) { background-color: #E0DFDD; }
#app[data-theme="flat"] table span                  { color: #525150; }
#app[data-theme="flat"] th                          { background-color: #E0DFDD; }
#app[data-theme="flat"] .white .poly > div,
.set-theme[data-theme="flat"] .cube,
.set-theme[data-theme="flat"] .cube:before,
.set-theme[data-theme="flat"] .cube:after           { background-color: #00A2FF; }
#app[data-theme="flat"] .black .poly > div          { background-color: #FF432F; }
#app[data-theme="flat"] .white .poly .sphere        { background: -webkit-radial-gradient(center, ellipse cover, rgba(0,162,255,1) 30%,rgba(0,89,141,1) 100%) 0em -1em; }
#app[data-theme="flat"] .black .poly .sphere        { background: -webkit-radial-gradient(center, ellipse cover, rgba(255,67,47,1) 30%,rgba(141,36,25,1) 100%) 0em -1em; }
#app[data-theme="flat"] .white.bishop .rectangle.a .tp:before, 
#app[data-theme="flat"] .white.bishop .rectangle.b .tp:before         { border-bottom: 1.1em solid #00A2FF; }
#app[data-theme="flat"] .white.bishop .rectangle.a .tp:after, 
#app[data-theme="flat"] .white.bishop .rectangle.b.prim .tp:after     { border-top: 1.1em solid #00A2FF; }
#app[data-theme="flat"] .black.bishop .rectangle.a .tp:before, 
#app[data-theme="flat"] .black.bishop .rectangle.b .tp:before         { border-bottom: 1.1em solid #FF432F; }
#app[data-theme="flat"] .black.bishop .rectangle.a .tp:after, 
#app[data-theme="flat"] .black.bishop .rectangle.b.prim .tp:after     { border-top: 1.1em solid #FF432F; }

/* ---------------------------------------------------------------------------------------------------- wireframe */

#app[data-theme="wireframe"] #scene                 { background: radial-gradient(center, ellipse cover, #1D414D 0%,#000000 70%); }
#app[data-theme="wireframe"] th                     { background-color: rgba(17,41,48,.6) }
#app[data-theme="wireframe"] #frame                 { background-color: #001B20; } 
#app[data-theme="wireframe"] #board:after, 
#app[data-theme="wireframe"] #frame:after, 
#app[data-theme="wireframe"] #frame:before          { background-color: #011E24; border: 1px solid #007385; opacity: .4 }
#app[data-theme="wireframe"] .square                { background-color: rgba(17,41,48,.0); }
#app[data-theme="wireframe"] tbody tr:nth-child(odd) .square:nth-child(even), 
#app[data-theme="wireframe"] tbody tr:nth-child(even) .square:nth-child(odd) { background-color: rgba(17,41,48,.6); }
#app[data-theme="wireframe"] .white .poly > div     { background-color: #022A36; border: 1px solid #35C2D3;
                                                     box-shadow: inset 0 0 4em -1em #35C2D3; opacity: .5; }
.set-theme[data-theme="wireframe"] .cube,
.set-theme[data-theme="wireframe"] .cube:before,
.set-theme[data-theme="wireframe"] .cube:after      { background-color: #022A36; border: 0px solid #35C2D3;
                                                      box-shadow: inset 0 0 .5em .2em #35C2D3; opacity: .8; }
#app[data-theme="wireframe"] .black .poly > div     { background-color: #022A36; border: 1px solid #FFDD1D;
                                                      box-shadow: inset 0 0 4em -1em #FFDD1D; opacity: .5; }
#app[data-theme="wireframe"] .white .poly .lt,
#app[data-theme="wireframe"] .white .poly .rt       { border-right: 3px solid #35C2D3; }
#app[data-theme="wireframe"] .white .poly .bk,
#app[data-theme="wireframe"] .white .poly .ft       { border-top: 3px solid #35C2D3; }
#app[data-theme="wireframe"] .black .poly .lt,
#app[data-theme="wireframe"] .black .poly .rt       { border-right: 3px solid #FFDD1D; }
#app[data-theme="wireframe"] .black .poly .bk,
#app[data-theme="wireframe"] .black .poly .ft       { border-top: 3px solid #FFDD1D; }
#app[data-theme="wireframe"] .black .poly .sphere   { background-color: #1D414B; }
#app[data-theme="wireframe"] .white .poly .sphere   { background-color: #1D414B; }

#app[data-theme="wireframe"] .white.bishop .rectangle.a .tp:before, 
#app[data-theme="wireframe"] .white.bishop .rectangle.b .tp:before       { border-bottom: 1.1em solid rgba(53,194,211,.4); top: -1em; left: -.18em;}
#app[data-theme="wireframe"] .white.bishop .rectangle.a .tp:after, 
#app[data-theme="wireframe"] .white.bishop .rectangle.b.prim .tp:after   { border-top: 1.1em solid rgba(53,194,211,.4); bottom: -1em; right: -.18em;}
#app[data-theme="wireframe"] .black.bishop .rectangle.a .tp:before, 
#app[data-theme="wireframe"] .black.bishop .rectangle.b .tp:before       { border-bottom: 1.1em solid rgba(255,221,29,.4); top: -1em; left: -.18em;}
#app[data-theme="wireframe"] .black.bishop .rectangle.a .tp:after, 
#app[data-theme="wireframe"] .black.bishop .rectangle.b.prim .tp:after   { border-top: 1.1em solid rgba(255,221,29,.4); bottom: -1em; right: -.18em;}

/* ------------------------------------------------------- Responsive board */

@media screen and (min-width: 48em), screen and (min-height: 48em) { 
  #app[data-frame="off"] { font-size: 80px; }
  #app[data-frame="on"] { font-size: 70px; } 
}
@media screen and (max-width: 48em), screen and (max-height: 48em) { 
  #app[data-frame="off"] { font-size: 70px; }
  #app[data-frame="on"] { font-size: 60px; } 
  #top-bar { margin-top: -.75em; }
}
@media screen and (max-width: 42em), screen and (max-height: 42em) { 
  #app[data-frame="off"] { font-size: 60px; }
  #app[data-frame="on"] { font-size: 50px; } 
  #container { top: 55%; } 
}
@media screen and (max-width: 34em), screen and (max-height: 34em) { 
  #app[data-frame="off"] { font-size: 50px; }
  #app[data-frame="on"] { font-size: 40px; } 
}
@media screen and (max-width: 26em), screen and (max-height: 26em) { 
  #app[data-frame="off"] { font-size: 40px; }
  #app[data-frame="on"] { font-size: 30px; } 
}
@media screen and (max-width: 20em), screen and (max-height: 20em) { 
  #app[data-frame="off"] { font-size: 35px; }
}
@media screen and (max-height: 36em) { 
  #logoimg { margin: 1em 0 1em 0; }
}
@media screen and (max-height: 32em) { 
  #app[data-state="menu"] #overlay {
    z-index: 99;
    opacity: .85;
  }
  #about h1 { font-size: 1em; }
  #about h2 { font-size: .85em; }
  #about p { font-size: .75em; }
}
@media screen and (max-width: 24em), screen and (max-height : 24em) { 
  h1 { font-size: 1.5em; }
  h2 { font-size: 1em; }
  #logoimg { margin: 2em 0 1em 0; }
  #logo { font-size: 12px }
  .loading #overlay { background-position: 50% 80%; }
}
!

JS 

              
                /*                                       

I had some issues running the javascript directly into codepen,
I wrapped everything in one external js file.
The full code can be found here : https://github.com/juliangarnier/3D-Hartwig-chess-set

*/
!
999px

Console