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CSS Base

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

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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Add 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 or require. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.


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If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

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

Editor Settings

Code Indentation

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HTML Settings

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              <section class="container">
  <header class="main-header">
    <h1>Page Title</h1>
  <aside class="sidebar">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Exercitationem quam optio quaerat, error quo alias autem aliquam ratione nisi nihil doloribus vero ab, repellendus! Illum velit doloremque minus eum voluptatibus!</p>
  <section class="main">
    <h2>Article Title</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Modi illum sed, ab aut, ex veniam. Molestiae ipsam eos, temporibus voluptatem minus! Obcaecati nulla dicta culpa quasi corporis saepe et necessitatibus.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Vitae, accusantium esse recusandae harum minus, officiis, laborum error placeat officia ullam obcaecati quisquam amet ab ipsum molestias porro hic minima eius?</p>
  <footer class="main-footer">&copy;copyright 2016</footer>
              .container {
  display: grid;
  grid-template-columns: 30% 70%;

.main-header, .main-footer {
  background-color: #333;
  color: #f9f9f9;
  grid-column: 1 / span 2;

.sidebar {
  background-color: #ddd;

.main-header, .main-footer, .sidebar, .main {
  padding: 20px;