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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

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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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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

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.

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Babel includes JSX processing.

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Packages

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HTML 

              
                <!--

🎉 INSTRUCTIONS:
Refactor the HTML and add appropriate CSs to this table-based layout so that it uses a more modern approach.

-->

<table class="site">
  <!-- Begin: Header -->
  <tr>
    <td>
      <table class="site-header">
        <tr>
          <td>
            <h1>NASA Astronauts</h1>
          </td>
          <td class="text-right">
            <ul>
              <li><a href="http://nasa.gov" target="_blank">nasa.gov</a></li>
              <li><a href="http://www.spacecamp.com" target="_blank">spacecamp.com</a></li>
            </ul>
          </td>
        </tr>
      </table>
    </td>
  </tr>
  <!-- End: Header -->
  <!-- Begin: Hero -->
  <tr>
    <td>
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/187/iss-aurora.jpg" alt="ISS above an aurora." />
    </td>
  </tr>
  <tr>
    <td class="spacing">
      <small class="caption">Photo courtesy of <a href="https://unsplash.com/search/nasa?photo=NuE8Nu3otjo">Unsplash</a></small>
    </td>
  </tr>
  <!-- End: Hero -->
  <!-- Begin: Main -->
  <tr>
    <td>
      <table>
        <tr>
          <!-- Begin: Content -->
          <td colspan="2" class="spacing">
            <h2>How to Become an Astronaut</h2>
            <p> The word "astronaut" comes from the Greek words meaning "space sailor". There are a variety of space professions and duties—for example, commander, pilot, or mission specialist—and varying qualifications for each. However, all qualifications include:<p>
            <ul>
              <li>Physical health requirements</li>
              <li>Height requirements</li>
              <li>Visual requirements</li>
              <li>Bachelor's degree from an accredited institution in engineering, biological science, physical science, or mathematics</li>
            </ul>
            <p><a href="https://www.nasa.gov/audience/forstudents/postsecondary/features/F_Astronaut_Requirements.html" target="_blank">Find out more about the requirements for becoming a NASA Astronaut.</a></p>
            <blockquote><em>"What everyone in the astronaut corps shares in common is not gender or ethnic background, but motivation, perseverance, and desire—the desire to participate in a voyage of discovery."</em> —Ellen Ochoa</blockquote>
          </td>
          <!-- End: Content -->
          <!-- Begin: Sidebar -->
          <td class="spacing">
            <img src="https://upload.wikimedia.org/wikipedia/commons/e/e5/NASA_logo.svg" alt="NASA Logo" />
            <small class="caption">NASA Logo from <a href="https://commons.wikimedia.org/wiki/File:NASA_logo.svg">Wikimedia Commons</a></small>
            <hr />
            <h3 class="widget-header">About NASA</h3>    
            <p>"The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program as well as aeronautics and aerospace research."</p>

            <a href="https://en.wikipedia.org/wiki/NASA" target="_blank">Read more about NASA</a>
          </td>
          <!-- End: Sidebar -->
        </tr>
        <tr>
          <td colspan="3" class="spacing">
            <h2>Women in Space</h2>
          </td>
        </tr>
        <tr>
          <!-- Begin: Astronauts -->
          <td width="33.33%" class="spacing">
            <h3>Mae Jemison</h3>
            <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/187/mae-jemison.jpg" alt="Image of Mae Jemison" />
            <p>The first African-American woman to travel in space. In September of 1992, she orbited aboard the Space Shuttle <em>Endeavour</em>.</p>
            <p><a href="https://en.wikipedia.org/wiki/Mae_Jemison" target="_blank">Read more about Mae</a></p>
          </td>
          <td width="33.33%" class="spacing">
            <h3>Anousheh Ansari</h3>
            <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/187/anousheh-ansari.jpg" alt="Image of Anousheh Ansari" />
            <p>The first Iranian woman in space and first self-funded woman to travel to the International Space Station (the fourth overall self-funded space traveler).</p>
            <p><a href="https://en.wikipedia.org/wiki/Anousheh_Ansari" target="_blank">Read more about Anousheh</a></p>
          </td>
          <td width="33.33%" class="spacing">
            <h3>K. Megan McArthur</h3>
            <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/187/megan-mcarthur.jpg" alt="Image of K. Megan McArthur" />
            <p>The last person to be “hands on” with the Hubble Space Telescope, the only telescope designed to be serviced in space by astronauts.</p>
            <p><a href="https://en.wikipedia.org/wiki/K._Megan_McArthur" target="_blank">Read more about Megan</a></p>
          </td>
          <!-- End: Astronauts -->
        </tr>
      </table>
    </td>
  </tr>
  <!-- End: Main -->
  <!-- Begin: Footer -->
  <tr class="site-footer">
    <td class="spacing">
      <small>This site is for educational purposes in connection with the <a href="https://www.gswo.org/">Girl Scouts of Western Ohio</a>. All image rights are retained solely by the original sources. Learn more at <a href="http://girlscancode.io">Girls Can Code</a>.</small>
    </td>
  </tr>
  <!-- End: Footer -->
</table>
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CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Bungee|Ubuntu';

body {
  font-family: Ubuntu, sans-serif;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/187/illusions.png);
  background-position: top center;
  background-color: black;
  margin: 20px;
  line-height: 26px;
}

table {
  border-collapse: collapse;
}

td {
  padding: 0;
}

h1, h2, h3 {
  font-family: Bungee;
}

.site {
  background-color: whitesmoke;
  background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/187/bright_squares.png);
  background-position: top center;
  background-attachment: fixed;
  width: 1000px;
  margin: auto;
  overflow: hidden;
}

.site-header {
  width: 100%;
  padding: 20px 40px;
  background: deepskyblue;
  border-bottom: 4px solid dodgerblue;
  color: snow;
}

.site-header td {
  padding: 1rem;
}

.site-header a {
  color: inherit;
  font-weight: bold;
  font-size: 1.25rem;
  text-decoration: none;
  margin-left: 1rem;
}

.site-footer {
  background: black;
  color: snow;
  line-height: 1.25;
}

.site-footer a {
  color: inherit;
}

.text-right {
  text-align: right
}

.spacing {
  padding: 1rem;
}
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JS
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999px

Console