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Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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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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Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

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Code Indentation


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Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

  <p>Ullam repudiandae<sup></sup> alias iure officia facere consectetur totam aliquid fuga perferendis ipsa ratione omnis eaque fugiat, quos explicabo, numquam tempora placeat cum. Aliquid dolores delectus doloremque recusandae, omnis optio vel rerum et. In accusamus quibusdam temporibus beatae laboriosam nihil architecto ab unde sequi, voluptatem expedita consectetur<sup></sup> incidunt itaque eum at! Dignissimos, impedit a! Ducimus, voluptas.</p>
    <li>The first note</li>
    <li>The second note</li>
              section {
  counter-reset: note;

sup::before {
  counter-increment: note;
  content: counter(note);

/* some styles */

body {
  line-height: 1.5;
  margin: 0 2em;
  max-width: 36em;

ol {
  font-size: 80%;
  border-top: 1px solid #bbb;
  padding: 1.5em;
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