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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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About the <head>

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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

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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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.

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HTML 

              
                <div class="hide"><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><symbol viewBox="-167.4 267.7 257.7 257.7" id="facebook"><path d="M76.1 267.7h-229.3c-7.9 0-14.2 6.4-14.2 14.2v229.3c0 7.9 6.4 14.2 14.2 14.2h123.4v-99.8h-33.6v-38.9h33.6V358c0-33.3 20.3-51.4 50-51.4 14.2 0 26.5 1.1 30 1.5v34.8H29.6c-16.1 0-19.3 7.7-19.3 18.9v24.8h38.5l-5 38.9H10.4v99.8h65.7c7.9 0 14.2-6.4 14.2-14.2V281.9c0-7.8-6.4-14.2-14.2-14.2z"/></symbol><symbol viewBox="-211.1 354.7 82.6 84.9" id="googleplus"><path d="M-167.5 403.2l-4-3.1c-1.2-1-2.9-2.3-2.9-4.8 0-2.4 1.7-4 3.1-5.4 4.6-3.7 9.3-7.5 9.3-15.7 0-8.4-5.3-12.9-7.8-15h6.8l7.2-4.5h-21.8c-6 0-14.6 1.4-20.9 6.6-4.8 4.1-7.1 9.8-7.1 14.8 0 8.6 6.6 17.4 18.3 17.4 1.1 0 2.3-.1 3.5-.2-.5 1.3-1.1 2.4-1.1 4.3 0 3.4 1.8 5.5 3.3 7.5-5 .3-14.3.9-21.1 5.1-6.5 3.9-8.5 9.5-8.5 13.5 0 8.2 7.7 15.8 23.8 15.8 19 0 29.1-10.5 29.1-20.9.1-7.5-4.4-11.3-9.2-15.4zm-14.5-12.7c-9.5 0-13.8-12.3-13.8-19.7 0-2.9.5-5.9 2.4-8.2 1.8-2.2 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37.3" id="paper-airplane"><path d="M-312.1 309l8.8 4.6 1.8 10.7c.1.7.7 1.2 1.3 1.3h.3c.6 0 1.1-.3 1.4-.7l4.6-7.5 9.7 4.8c.2.1.5.2.7.2s.5-.1.7-.2c.5-.2.8-.7.9-1.2l4.8-30c.2-.9-.3-1.9-1.2-2.3-.7-.4-1.6-.4-2.2 0l-31.9 17.4c-.5.3-.8.8-.8 1.5.2.6.5 1.2 1.1 1.4zm27.4 9.3l-7.4-3.6 10.8-17.4-3.4 21zm-11.2-3.9l-3.1 5-1.1-6.3 12.9-12.8-8.7 14.1zm7.8-17.7l-14.1 13.8-5.8-3 19.9-10.8z"/></symbol><symbol viewBox="-326.8 274.8 63.7 64.5" id="person"><path d="M-282.1 306.7l-2.5-1.1 1.8-2.1c2.6-3.1 4.1-6.9 4.1-10.9v-1.2c0-9.2-7.5-16.8-16.8-16.8h-1.2c-9.2 0-16.8 7.6-16.8 16.8v1.2c0 4.2 1.6 8.3 4.6 11.5l1.9 2-2.5 1.2c-10.7 5.1-17.6 16.1-17.6 27.9 0 2.2 1.8 4.1 4.1 4.1s4.1-1.8 4.1-4.1c0-12.5 10.2-22.8 22.8-22.8.2 0 .4 0 .6-.1l.3-.1.3.1c.3 0 .5.1.6.1 12.5 0 22.8 10.2 22.8 22.8 0 2.2 1.8 4.1 4.1 4.1 2.2 0 4.1-1.8 4.1-4.1.1-12.5-7.3-23.6-18.8-28.5zm-4.7-14.4v.4c0 4.7-3.9 8.6-8.6 8.7h-.8c-4.8 0-8.6-3.9-8.6-8.7v-1.2c0-2.3.9-4.5 2.5-6.1 1.6-1.6 3.8-2.5 6.1-2.5h1.2c4.8 0 8.6 3.9 8.6 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37.9 74.7 22 8 53.2 1.2 69.8-7.3-9.2 22.6-32.4 36.1-63.6 38.6 16.5 7.3 42.2 9.8 65.5 7.3.6 1.2-2.4 4.3-4.3 6.1-14.8 12.6-36.9 20.5-65 20.5-16.5 61.2-53.9 106.5-99.8 138.3-46.5 32.4-105.9 54.5-181.2 57.5-3.6-.6-8.5-.6-12.8-.6z"/></symbol><symbol viewBox="-324.7 285.2 59.4 43.7" id="video-player"><path d="M-271.2 285.2h-47.6c-3.3 0-5.9 2.7-5.9 5.9v31.8c0 3.3 2.7 5.9 5.9 5.9h47.6c3.3 0 5.9-2.7 5.9-5.9v-31.8c0-3.3-2.6-5.9-5.9-5.9zm0 37.7h-47.6v-31.8h47.6v31.8zM-304.2 319.3c.5.3 1 .4 1.5.4s1-.1 1.5-.4l16.8-9.7c.9-.5 1.5-1.5 1.5-2.6s-.6-2-1.5-2.6l-16.8-9.7c-.9-.5-2-.5-3 0-.9.5-1.5 1.5-1.5 2.6v19.5c.1 1 .6 2 1.5 2.5zm4.5-16.9l8 4.6-8 4.6v-9.2z"/></symbol></svg></div>

<header class="main-head">
      <nav class="head-nav">
        <ul class="menu">
          <li>
            <a href="#">
              <svg class="person">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#person"></use>
              </svg><span>About</span></a>
          </li>
          <li>
            <a href="#">
              <svg class="video-player">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#video-player"></use>
              </svg><span>Work</span></a>
          </li>
          <li>
            <a href="#">
              <svg class="speech-bubble">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#speech-bubble"></use>
              </svg><span>Blog</span></a>
          </li>
          <li>
            <a href="#">
              <svg class="paper-airplane">
                <use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#paper-airplane"></use>
              </svg><span>Contact</span></a>
          </li>
        </ul>
      </nav>
</header> <!-- //main-head -->

<div class="wrap-all-the-things"></div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto:300);

$color-1: #1a1a1a;
$color-2: #fefefe;
$pad:     0.925rem;

html,
body{
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  font-family: Roboto;
  height: 100%;
}
.hide{
  display: none;
}
.head-nav {
  li{
    &:hover{
        background-color: $color-1;
        &:before{
            background-color: $color-1;
        }
        svg{
            background: $color-1;
            fill: #ED1C5B;
        }
        a{
          color: #ED1C5B;
        }
    }
    &:before{
        position: absolute;
        left: -$pad;
        top: 0;
        width: $pad;
        height: 100%;
        content: "";
        background: #ED1C5B;
        z-index: 1;
        transition: background 400ms;
    }
  }
  ul{
      margin: {top:$pad*2;right:0;bottom:0;left:0;}
      padding: 0;
      list-style: none;
  }
  li{
      position: relative;
      clear: both;
      width: 100%;
      padding: 0;
      transition: background 400ms;
      a{
          display: flex;
          padding: {top:2vh;bottom:2vh;}
      }
  }
  a{
      align-items: center;
      width: 100%;
      color: $color-2;
      text-decoration: none;
      transition: color 400ms;
      span{
          position: relative;
          display: block;
          z-index: 0;
          font-family: Roboto;
          text-indent: -20em;
          white-space: nowrap;
          transition: text-indent 400ms ease-in-out;
      }
  }
  svg{
      position: relative;
      max-width: 80px;
      max-height: 30px;
      z-index: 1;
      fill: $color-2;
      background: #ED1C5B;
      transition: 400ms;
  }
  @media screen and (max: 768px){
      ul{
          margin: {top:$pad/4}
      }
      svg{
          max-width: 20px;
      }
  }
}
.main-head{
  position: fixed;
  bottom: 0;
  width: 83px;
  height: 100%;
  z-index: 1;
  background: #ED1C5B;
  transition: width 400ms;
  &:hover{
      width: 436px;
      & + .wrap-all-the-things{
          transform: translateX(336px);
          max-width: 100%;
          opacity: 0.4;
      }
      .head-nav{
          li{
              @for $i from 1 through 4 {
                  &:nth-of-type(#{$i}){
                      span{
                          transition-delay: 100ms * $i;
                      }
                  }
              }
          }
          span{
              text-indent: 0;
          }
      }
  }
  @media screen and (max: 768px){
      width: 70px;
      padding: 0 $pad;
      .head-nav{
          padding: {left:7px;}
      }
      &:hover{
          .head-nav{
              span{
                  text-indent: 1em;
              }
          }
      }
  }
}
.wrap-all-the-things{
  min-height: 100%;
  height: 100%;
  padding: {left:140px;}
  margin: {top: 0;}
  background-image: url(https://download.unsplash.com/photo-1428976365951-b70e0fa5c551);
  background-size: cover;
  background-position: center center;
  transition: transform 400ms, opacity 400ms;
  @media screen and (max: 480px){
      padding: {left:70px;}
  }
}
!

JS
!
999px

Console