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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.

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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>

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.

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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.

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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.

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JavaScript

About JavaScript Preprocessors

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

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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.

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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.

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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.

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HTML 

              
                <input type="radio" class="radio" name="pages" id="exit" checked />

    <div class="page demo2">

      <input type="radio" class="radio" name="pages" id="page_1" />
      <section class="section-container section-one">
        <label for="exit" class="check-label exit-label">
          X
        </label>
        <label for="page_1" class="page-label check-label">
          <span>Page 1</span>
        </label>
        <header class="section-header">
          <div class="section-content">
            <h1>
              Title of Section One
            </h1>
          </div>
        </header>
        <div class="section-info">
          <div class="section-content">
            <p>
              Bacon ipsum dolor sit amet tenderloin jowl drumstick ribeye strip steak prosciutto jerky kielbasa, pig flank porchetta. Salami tenderloin porchetta tongue t-bone pork chop bacon bresaola cow boudin strip steak jerky tail landjaeger doner. Pancetta turducken biltong porchetta kielbasa. Venison meatloaf rump landjaeger shoulder. T-bone pork chop doner fatback ground round chicken, ham hock drumstick kevin tenderloin salami boudin kielbasa turkey bresaola. Venison pastrami boudin meatball tenderloin jerky strip steak frankfurter bresaola doner landjaeger. Capicola andouille ground round pork loin short loin, tenderloin ham porchetta shoulder pancetta strip steak pork belly sausage.
            </p>
            <p>
              Tri-tip pork loin t-bone chicken tenderloin, porchetta fatback sirloin pork ham pig. Doner kielbasa chuck ground round. Chicken kielbasa tail venison shank salami. Chuck strip steak ham shank spare ribs drumstick ham hock jerky corned beef bresaola fatback sirloin t-bone doner shankle. Short loin ground round prosciutto turkey pork belly pastrami chuck. Hamburger pork belly swine, andouille filet mignon t-bone pork loin ball tip beef ribs beef pig spare ribs turducken shankle jerky.
            </p>
            <p>
              Capicola doner pancetta tenderloin cow leberkas beef turducken ham hock pork loin ball tip. Shoulder biltong pork belly, kielbasa pork ball tip jerky flank. Pastrami andouille doner, leberkas corned beef shoulder pig ham hock pork rump t-bone. Kevin sausage ball tip, tri-tip prosciutto pork shank brisket.
            </p>
          </div>
        </div>
      </section>

      <input type="radio" class="radio" name="pages" id="page_2" />
      <section class="section-container section-two">
        <label for="exit" class="check-label exit-label">
          X
        </label>
        <label for="page_2" class="page-label check-label">
          <span>Page 2</span>
        </label>
        <header class="section-header">
          <div class="section-content">
            <h1>
              Title of Other Section Two
            </h1>
          </div>
        </header>
        <div class="section-info">
          <div class="section-content">
            <p>
              Bacon ipsum dolor sit amet tenderloin jowl drumstick ribeye strip steak prosciutto jerky kielbasa, pig flank porchetta. Salami tenderloin porchetta tongue t-bone pork chop bacon bresaola cow boudin strip steak jerky tail landjaeger doner. Pancetta turducken biltong porchetta kielbasa. Venison meatloaf rump landjaeger shoulder. T-bone pork chop doner fatback ground round chicken, ham hock drumstick kevin tenderloin salami boudin kielbasa turkey bresaola. Venison pastrami boudin meatball tenderloin jerky strip steak frankfurter bresaola doner landjaeger. Capicola andouille ground round pork loin short loin, tenderloin ham porchetta shoulder pancetta strip steak pork belly sausage.
            </p>
            <p>
              Tri-tip pork loin t-bone chicken tenderloin, porchetta fatback sirloin pork ham pig. Doner kielbasa chuck ground round. Chicken kielbasa tail venison shank salami. Chuck strip steak ham shank spare ribs drumstick ham hock jerky corned beef bresaola fatback sirloin t-bone doner shankle. Short loin ground round prosciutto turkey pork belly pastrami chuck. Hamburger pork belly swine, andouille filet mignon t-bone pork loin ball tip beef ribs beef pig spare ribs turducken shankle jerky.
            </p>
            <p>
              Capicola doner pancetta tenderloin cow leberkas beef turducken ham hock pork loin ball tip. Shoulder biltong pork belly, kielbasa pork ball tip jerky flank. Pastrami andouille doner, leberkas corned beef shoulder pig ham hock pork rump t-bone. Kevin sausage ball tip, tri-tip prosciutto pork shank brisket.
            </p>
          </div>
        </div>
      </section>


      <input type="radio" class="radio" name="pages" id="page_3" />
      <section class="section-container section-three">
        <label for="exit" class="check-label exit-label">
          X
        </label>
        <label for="page_3" class="page-label check-label">
          <span>Page 3</span>
        </label>
        <header class="section-header">
          <div class="section-content">
            <h1>
              Title of Section Three
            </h1>
          </div>
        </header>
        <div class="section-info">
          <div class="section-content">
            <p>
              Bacon ipsum dolor sit amet tenderloin jowl drumstick ribeye strip steak prosciutto jerky kielbasa, pig flank porchetta. Salami tenderloin porchetta tongue t-bone pork chop bacon bresaola cow boudin strip steak jerky tail landjaeger doner. Pancetta turducken biltong porchetta kielbasa. Venison meatloaf rump landjaeger shoulder. T-bone pork chop doner fatback ground round chicken, ham hock drumstick kevin tenderloin salami boudin kielbasa turkey bresaola. Venison pastrami boudin meatball tenderloin jerky strip steak frankfurter bresaola doner landjaeger. Capicola andouille ground round pork loin short loin, tenderloin ham porchetta shoulder pancetta strip steak pork belly sausage.
            </p>
            <p>
              Tri-tip pork loin t-bone chicken tenderloin, porchetta fatback sirloin pork ham pig. Doner kielbasa chuck ground round. Chicken kielbasa tail venison shank salami. Chuck strip steak ham shank spare ribs drumstick ham hock jerky corned beef bresaola fatback sirloin t-bone doner shankle. Short loin ground round prosciutto turkey pork belly pastrami chuck. Hamburger pork belly swine, andouille filet mignon t-bone pork loin ball tip beef ribs beef pig spare ribs turducken shankle jerky.
            </p>
            <p>
              Capicola doner pancetta tenderloin cow leberkas beef turducken ham hock pork loin ball tip. Shoulder biltong pork belly, kielbasa pork ball tip jerky flank. Pastrami andouille doner, leberkas corned beef shoulder pig ham hock pork rump t-bone. Kevin sausage ball tip, tri-tip prosciutto pork shank brisket.
            </p>
          </div>
        </div>
      </section>


      <input type="radio" class="radio" name="pages" id="page_4" />
      <section class="section-container section-four">
        <label for="exit" class="check-label exit-label">
          X
        </label>

        <label for="page_4" class="page-label check-label">
          <span>Page 4</span>
        </label>
        <header class="section-header">
          <div class="section-content">
            <h1>
              Title of Section Four
            </h1>
          </div>
        </header>
        <div class="section-info">
          <div class="section-content">
            <p>
              Bacon ipsum dolor sit amet tenderloin jowl drumstick ribeye strip steak prosciutto jerky kielbasa, pig flank porchetta. Salami tenderloin porchetta tongue t-bone pork chop bacon bresaola cow boudin strip steak jerky tail landjaeger doner. Pancetta turducken biltong porchetta kielbasa. Venison meatloaf rump landjaeger shoulder. T-bone pork chop doner fatback ground round chicken, ham hock drumstick kevin tenderloin salami boudin kielbasa turkey bresaola. Venison pastrami boudin meatball tenderloin jerky strip steak frankfurter bresaola doner landjaeger. Capicola andouille ground round pork loin short loin, tenderloin ham porchetta shoulder pancetta strip steak pork belly sausage.
            </p>
            <p>
              Tri-tip pork loin t-bone chicken tenderloin, porchetta fatback sirloin pork ham pig. Doner kielbasa chuck ground round. Chicken kielbasa tail venison shank salami. Chuck strip steak ham shank spare ribs drumstick ham hock jerky corned beef bresaola fatback sirloin t-bone doner shankle. Short loin ground round prosciutto turkey pork belly pastrami chuck. Hamburger pork belly swine, andouille filet mignon t-bone pork loin ball tip beef ribs beef pig spare ribs turducken shankle jerky.
            </p>
            <p>
              Capicola doner pancetta tenderloin cow leberkas beef turducken ham hock pork loin ball tip. Shoulder biltong pork belly, kielbasa pork ball tip jerky flank. Pastrami andouille doner, leberkas corned beef shoulder pig ham hock pork rump t-bone. Kevin sausage ball tip, tri-tip prosciutto pork shank brisket.
            </p>
          </div>
        </div>
      </section>

    </div>
!

CSS 

              
                *, *:after, *:before {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box; }

body {
  background: #fafafa;
  font-family: arial narrow, arial;
  font-size: 120%;
  margin: 0; }

body, html, .page {
  height: 100%;
  overflow: hidden; }

:last-child {
  margin-bottom: 0; }

h1, h2, h3, h4,
h5, h6, p, li {
  margin-top: 0; }

article, aside, canvas,
footer, header, main, section {
  display: block; }

.page {
  position: fixed;
  top: 0;
  width: 100%; }

.radio,
.exit-label {
  display: none;
  visibility: hidden; }

.exit-label {
  border: 1px solid #333;
  color: #444;
  display: inline-block;
  padding: 4px 12px;
  text-decoration: none; }

.page-label {
  height: 100%;
  left: 0;
  position: absolute;
  text-align: center;
  top: 0;
  width: 100%; }
  .page-label span {
    position: relative;
    top: 50%; }

.check-label {
  cursor: pointer; }
  .check-label:hover, .check-label:active {
    background: rgba(0, 0, 0, 0.3);
    color: #fff; }
  .check-label:focus {
    outline: thin dotted; }

.section-container {
  -moz-transition: 0.4s all;
  -webkit-transition: 0.4s all;
  transition: 0.4s all;
  -moz-transform-origin: center center;
  -ms-transform-origin: center center;
  -o-transform-origin: center center;
  -webkit-transform-origin: center center;
  transform-origin: center center;
  border: 0px solid;
  height: 50%;
  overflow: hidden;
  position: fixed;
  width: 50%;
  z-index: 1; }
.section-content {
  -moz-transition: 0.66s all;
  -webkit-transition: 0.66s all;
  transition: 0.66s all;
  margin: auto;
  max-width: 800px;
  padding: 20px;
  opacity: 0;
  visibility: hidden; }

:checked + .section-container {
  -moz-transform: translate(0%, 0%);
  -ms-transform: translate(0%, 0%);
  -o-transform: translate(0%, 0%);
  -webkit-transform: translate(0%, 0%);
  transform: translate(0%, 0%);
  width: 100%;
  height: 100%;
  z-index: 5;
  overflow: auto; }
  :checked + .section-container .exit-label {
    display: inline-block;
    visibility: visible; }
  :checked + .section-container .page-label {
    display: none; }
  :checked + .section-container .section-content {
    opacity: 1;
    visibility: visible; }

.section-one {
  -moz-transform: translate(0%, 0%);
  -ms-transform: translate(0%, 0%);
  -o-transform: translate(0%, 0%);
  -webkit-transform: translate(0%, 0%);
  transform: translate(0%, 0%);
  background: #f5bfb8; }

.section-two {
  -moz-transform: translate(0%, 100%);
  -ms-transform: translate(0%, 100%);
  -o-transform: translate(0%, 100%);
  -webkit-transform: translate(0%, 100%);
  transform: translate(0%, 100%);
  background: #c8f4f2; }

.section-three {
  -moz-transform: translate(100%, 0%);
  -ms-transform: translate(100%, 0%);
  -o-transform: translate(100%, 0%);
  -webkit-transform: translate(100%, 0%);
  transform: translate(100%, 0%);
  background: #c8f4c8; }

.section-four {
  -moz-transform: translate(100%, 100%);
  -ms-transform: translate(100%, 100%);
  -o-transform: translate(100%, 100%);
  -webkit-transform: translate(100%, 100%);
  transform: translate(100%, 100%);
  background: #eef4c8; }

#exit:checked + .page .section-container {
  border: none;
  opacity: 1; }

.page :not(:checked) + .section-container {
  border: 40px solid; }
!

JS 

              
                // Demo by Scott O'Hara. See article: http://www.sitepoint.com/you-can-do-that-with-css/

// inspired by https://tympanus.net/codrops/2013/04/23/fullscreen-layout-with-page-transitions/

// this requires no javascript to function, however it is not keyboard accessible.

// coming soon: JS accessibility solution
!
999px

Console