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Adding Classes

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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.

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Insecure Resource

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CSS

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                  <div class="container">
    <header>
      <h1>Follow Me On Social Media</h1>
    </header>
    <ul class="accordion">
      <li class="tab">
        <div class="social youtube">
          <a href="https://youtube.com/traversymedia" target="_blank">Youtube</a>
        </div>
        <div class="content">
          <h1>YouTube</h1>
          <p>Follow me on YouTube for tutorials with the latest technology in webv development</p>
        </div>
      </li>
      <li class="tab">
        <div class="social twitter">
          <a href="https://twitter.com/traversymedia" target="_blank">Twitter</a>
        </div>
        <div class="content">
          <h1>Twitter</h1>
          <p>Follow me on Twitter for video and course updates, article & blog shares and more</p>
        </div>
      </li>
      <li class="tab">
        <div class="social facebook">
          <a href="https://facebook.com/traversymedia" target="_blank">Facebook</a>
        </div>
        <div class="content">
          <h1>Facebook</h1>
          <p>Follow me on Facebook to stay up to date with Traversy Media and get notified of new videos, publications, etc</p>
        </div>
      </li>
      <li class="tab">
        <div class="social linkedin">
          <a href="https://www.linkedin.com/in/bradtraversy" target="_blank">LinkedIn</a>
        </div>
        <div class="content">
          <h1>LinkedIn</h1>
          <p>Connect with me on a professional level on Linkedin</p>
        </div>
      </li>
      <li class="tab">
        <div class="social instagram">
          <a href="http://instagram.com/traversymedia" target="_blank">Instagram</a>
        </div>
        <div class="content">
          <h1>Instagram</h1>
          <p>Follow me on Instragram for a more personal look into my life and work</p>
        </div>
      </li>
      <li class="tab">
        <div class="social github">
          <a href="http://github.com/bradtraversy" target="_blank">Github</a>
        </div>
        <div class="content">
          <h1>Github</h1>
          <p>Check out my Github for tutorial code, my personal projects and more</p>
        </div>
      </li>
    </ul>
  </div>
!

CSS 

              
                * {
  margin: 0;
  padding: 0;
  border: 0;
}

body {
  background-color: #222;
  font-family: Arial, Helvetica, sans-serif;
}

@font-face {
  font-family: 'Genericons';
  src: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/53819/genericons-regular-webfont.eot");
  src: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/53819/genericons-regular-webfont.woff") format("woff"), url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/53819/genericons-regular-webfont.eot") format("truetype");
}

.container {
  margin: 50px auto;
  width: 90%;
}

header h1 {
  color: #fff;
  margin-bottom: 10px;
  text-align: center;
}

.accordion {
  background: #333;
  width: 100%;
  min-width: 800px;
  display: block;
  list-style-type: none;
  overflow: hidden;
  height: 200px;
  font-size: 0;
}

.tab {
  display: inline-block;
  background-color: #444;
  border-right: #333 1px solid;
  width: 80px;
  height: 200px;
  overflow: hidden;
  position: relative;
  margin: 0;
  transition: all 0.5s ease-in-out 0.1s;
}

.tab:hover {
  width: 450px;
}

.tab:hover .social a:before {
  margin-left: -100px;
}

.tab:hover .social a:after {
  margin-left: -5px;
}

.tab .content {
  background: #fff;
  width: 360px;
  height: 200px;
  margin-left: 80px;
  padding: 50px 0 0 15px;
  position: relative;
}

.tab .content h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.tab .content p {
  font-size: 0.85rem;
  line-height: 1.4rem;
  padding-right: 30px;
}

.social a:after,
.social a:before {
  transition: all 0.4s ease-in-out 0.1s;
  width: 80px;
  height: 200px;
  position: absolute;
  text-indent: 0;
  padding-top: 90px;
  padding-left: 25px;
  display: block;
  font: normal 30px Genericons;
  color: #fff;
}

.social a:after {
  font-size: 48px;
  padding-left: 20px;
  padding-top: 80px;
  margin-left: 85px;
}

.youtube a:before,
.youtube a:after {
  content: '\f213';
}
.youtube a:after {
  background-color: #ff0000;
}

.twitter a:before,
.twitter a:after {
  content: '\f202';
}
.twitter a:after {
  background-color: #6dc5dd;
}

.facebook a:before,
.facebook a:after {
  content: '\f204';
}
.facebook a:after {
  background-color: #3b5998;
}

.linkedin a:before,
.linkedin a:after {
  content: '\f208';
}
.linkedin a:after {
  background-color: #00a9cd;
}

.instagram a:before,
.instagram a:after {
  content: '\f215';
}
.instagram a:after {
  background-color: #6dc993;
}

.github a:before,
.github a:after {
  content: '\f200';
}
.github a:after {
  background-color: #6e5494;
}

@media (max-width: 950px) {
  .container {
    width: 70%;
  }

  .tab {
    display: block;
    width: 100%;
    border-bottom: 3px #333 solid;
  }

  .accordion {
    display: block;
    min-width: 450px;
    height: auto;
  }

  .tab .content {
    width: 85%;
  }

  .tab:hover {
    width: 100%;
  }
}

@media (max-width: 680px) {
  .container {
    width: 95%;
  }

  .accordion {
    width: 100%;
    min-width: 350px;
  }
}
!

JS
!
999px

Console