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HTML

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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.

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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>

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Insecure Resource

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CSS

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

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CSS Base

About CSS Base

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Vendor Prefixing

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <h2>Expanding CSS3/jQuery Panel</h2>
<p class="about">A combination of very basic HTML, CSS and a little ( just a tiny ) bit of jQuery you can achieve a pretty nifty, clean expanding tile. Feel free to use this code, or the concept to create your own Expanding CSS3/jQuery Panels. </p>

  <ul class="wrapper">
    
    <li>
    <div class="info-box-green">
      <h4 class="entypo-tools"> Featured Services</h4>
  
      <div class="info-content">
        <div class="text">
          <p>Brewpub conditioning tank cask conditioned ale original gravity. ipa specific gravity grainy; amber berliner weisse. squares keg; lauter. krausen wheat beer glass barley? barleywine cask conditioning, hard cider hydrometer.</p>
        </div>
        <span class="entypo-plus" id="expand-green"></span>
      </div>
    </div>
  </li>
  
  <li>
    <div class="info-box-red">
      <h4 class="entypo-lifebuoy"> Support Services</h4>
  
      <div class="info-content">
        <div class="text">
          <p>Brewpub conditioning tank cask conditioned ale original gravity. ipa specific gravity grainy; amber berliner weisse. squares keg; lauter. krausen wheat beer glass barley? barleywine cask conditioning, hard cider hydrometer.</p>
        </div>
        <span class="entypo-plus" id="expand-red"></span>
      </div>
    </div>
  </li>
    
    <li>
    <div class="info-box-sky">
      <h4 class="entypo-lifebuoy"> Support Services</h4>
  
      <div class="info-content">
        <div class="text">
          <p>Brewpub conditioning tank cask conditioned ale original gravity. ipa specific gravity grainy; amber berliner weisse. squares keg; lauter. krausen wheat beer glass barley? barleywine cask conditioning, hard cider hydrometer.
          <br><br>
            Brewpub conditioning tank cask conditioned ale original gravity. ipa specific gravity grainy; amber berliner weisse. squares keg; lauter. krausen wheat beer glass barley? barleywine cask conditioning, hard cider hydrometer.
            <br><br>
            Brewpub conditioning tank cask conditioned ale original gravity. ipa specific gravity grainy; amber berliner weisse. squares keg; lauter. krausen wheat beer glass barley? barleywine cask conditioning, hard cider hydrometer.
          </p>
          
        </div>
        <span class="entypo-plus" id="expand-sky"></span>
      </div>
    </div>
  </li>
</ul>
!

CSS 

              
                /* Google Font */
@import url(https://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700);

/* Font Icons from WeLoveIconFonts */
@import url(http://weloveiconfonts.com/api/?family=entypo);

/* entypo */
[class*="entypo-"]:before {
  font-family: 'entypo', sans-serif;
}

.entypo-mail {
  margin-right: 10px;
}

/* ClearFix Hack */

.cf:before,
.cf:after {
    content: " "; /* 1 */
    display: table; /* 2 */
}

.cf:after { clear: both; }

/* For IE 6/7 only */
.cf { *zoom: 1; }


/* --------------------------
Customized CSS
---------------------------*/

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  font-size: 16px;
  font-family: 'Open Sans', sans-serif;
  font-weight: 300;
  background-color: #162E33;
}

.wrapper {
  width: 820px;
  margin: 0 auto;
  padding: 0;
}

.wrapper > li {
  display: inline;
  margin: 0;
}

h2 {
  padding: 45px;
  font-family: inherit;
  font-size: 2.5em;
  font-weight: 600;
  color: #00AB83;
  text-transform: uppercase;
  text-align: center;
  text-shadow: 0px 3px 0px #;
        filter: dropshadow(color=#266B68, offx=0, offy=1);
}

.about {
  margin: 0 auto;
  padding: 0;
  line-height: 1.5em;
  font-size: 1.1em;
  width: 640px;
  color: #FFF;
  text-align: center;
}

/* Box Styling */

.info-box-green, .info-box-red, .info-box-sky {
  margin: 50px auto;
  padding: 0;
  width: 480px;
 	-webkit-box-shadow: 0 8px 6px -6px black;
	   -moz-box-shadow: 0 8px 6px -6px black;
	        box-shadow: 0 8px 6px -6px black;
}

.info-box-red h4 {
  -webkit-border-radius: 10px;
  border-radius: 10px;
  margin-bottom: -10px;
}

.info-box-red > .info-content > .text {
 -webkit-border-radius: 0 0 10px 10px;
  border-radius: 0 0 10px 10px; 
}

.info-box-green h4, .info-box-green > .info-content > .text {
 background-color: #00AB83;
}

.info-box-red h4, .info-box-red > .info-content > .text {
  background-color: #FF434C;
}

.info-box-sky h4, .info-box-sky > .info-content > .text {
  background-color: #00A5C3;
}

.info-box-green h4, .info-box-red h4, .info-box-sky h4 {
  padding: 25px;
  font-size: 1.125em;
  font-weight: 400;
  color: #FFF;
}

.info-box-green > .info-content > .text, .info-box-red > .info-content > .text, .info-box-sky > .info-content > .text {
  padding: 0px;
  font-size: 1em;
  line-height: 1.5em;
  height: 0;
  color: #FFF;
  overflow: hidden;
  -webkit-transition:  height 200ms ease;  
     -moz-transition:  height 200ms ease;  
       -o-transition:  height 200ms ease;  
          transition:  height 200ms ease;
}

.info-box-green > .info-content > .text > p, .info-box-red > .info-content > .text > p, .info-box-sky > .info-content > .text > p {
  padding: 20px 20px 60px;
}

.info-box-sky > .info-content > .text {
  background-color: #FFF;
  color: #444;
  border-radius: 0;
}
 
.info-box-green > .info-content > .text.open-green, .info-box-red > .info-content > .text.open-red, .info-box-sky > .info-content > .text.open-sky {
  display: block;
  height: auto;
}

.info-box-green > .info-content > span.close-green, .info-box-red > .info-content > span.close-red, .info-box-sky > .info-content > span.close-sky {
  -webkit-transform:rotate(135deg);
     -moz-transform:rotate(135deg);
       -o-transform:rotate(135deg);
      -ms-transform:rotate(135deg);
}

.info-box-green span, .info-box-red span, .info-box-sky span {
  display: inline-block;
  float: right;
  position: relative;
  bottom: 60px;
  right: 10px;
  margin: 0;
  padding: 10px;
  color: #FFF;
  font-size: 2em;
  cursor: pointer;
  /*  Rotate '+' to 'X' */
  -webkit-transition: all 600ms ease-in-out; 
     -moz-transition: all 600ms ease-in-out; 
       -o-transition: all 600ms ease-in-out; 
      -ms-transition: all 600ms ease-in-out; 
          transition: all 600ms ease-in-out;
}

.info-box-sky > .info-content > span.close-sky {
  color: #444;
}

.info-box-red span {
  position: relative;
  bottom: 50px;
  right: 10px;
}
!

JS 

              
                // Green Button Js
$('#expand-green').on('click', function() {
  $(this).toggleClass('close-green');
  $('.text').toggleClass('open-green')
  .end();
});

// Red Button JS
$('#expand-red').on('click', function() {
  $(this).toggleClass('close-red');
  $('.text').toggleClass('open-red')
});

// Blue Button JS
$('#expand-sky').on('click', function() {
  $(this).toggleClass('close-sky');
  $('.text').toggleClass('open-sky');
});
!
999px

Console