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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>

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

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).

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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

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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HTML 

              
                <div class="listing">
  <div class="box-title">
    <h1>This is a title</h1>

    <p>This is the introductory text for this section of the site.</p>

  </div>
  <div class="box-feature">
    <img class="box-image" src="http://placehold.it/900x450" alt="placeholder">

    <h2 class="box-feature-title">Featured Item</h2>
    <div class="box-content">
      <p>The first, therefore usually the latest but could be flagged as a feature, item is the feature. This item gets a big spot up next to the title of this section.</p>
      <p>It might have an image too. It's special like that.</p>
    </div>
  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer box-talk box-media">
    <img src="http://placehold.it/500x350" alt="placeholder" />
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-newer">
    <h3>New Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a larger box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>
  <div class="box-older">
    <h3>Older Item</h3>
    <p>The newer items or next in priority after the feature are displayed in a smaller box. We can show additional content for these items.</p>

  </div>

</div>
!

CSS 

              
                .box-feature {
  grid-column: 4 / -1;
  grid-row: 1 / 2;
  display: grid;
  grid-gap: 20px;
  grid-template-columns: repeat(6, 1fr);
}

.box-feature .box-image {
  align-self: stretch;
  justify-self: stretch;
  grid-column: 1 / -1;
  grid-row: 1 / 4;
}

.box-feature .box-feature-title {
  grid-column: 3 / -1;
  grid-row: 1;
  background-color: rgba(0, 0, 0, 0.7);
  color: #fff;
  align-self: start;
  padding: 20px;
}

.box-feature .box-content {
  grid-column: 2 / -1;
  grid-row: 2;
  background-color: rgba(0, 0, 0, 0.7);
  color: #fff;
  padding: 20px;
}

.box-newer {
  padding: 20px;
  grid-column: auto / span 4;
}

.box-newer.box-media {
  grid-row-end: span 2;
  border: 1px dotted #7fdeff;
  background-color: transparent;
}

.box-newer.box-media,
.box-newer.box-media:nth-child(2n+1) {
  border: 1px dotted #7fdeff;
  background-color: transparent;
}

.box-newer:nth-child(2n+1) {
  background-color: #7fdeff;
}

.box-older {
  padding: 20px;
  font-size: 0.75rem;
  grid-column: auto / span 3;
}

.box-title {
  background-color: #694486;
  color: #fff;
  padding: 20px;
  align-self: start;
  grid-column: 1 / 4;
  grid-row: 1 / 2;
}

.listing {
  margin: 0 20px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 20px;
}
!

JS
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999px

Console