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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.

Quick-add: + add another resource

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.

Quick-add: + add another resource

Code Indentation


Save Automatically?

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.

              <h1 class="red underline">Example heading</h1>

  At some point in this demo paragraph, you’re going to run into some underlined text. Look at it all important-like. It’s supposed to be wrapping also. Very important.
  <span class="underline">Wait — is this the underlined text right now? Am I, this here string of text, underlined and wrapping? Wow, what an honor.</span>
              .red {
  color: red;

.underline {
  text-decoration: underline;

// ----- Unrelated ----- //

html {
  $square-color: #f4f4f4;
  $square-size: 8px;
  line-height: 1;
    linear-gradient(45deg, $square-color 25%, transparent 25%, transparent 75%, $square-color 75%, $square-color), 
    linear-gradient(45deg, $square-color 25%, transparent 25%, transparent 75%, $square-color 75%, $square-color);
  background-position: 0 0, $square-size $square-size;
  background-size: ($square-size * 2) ($square-size * 2);
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 19px;
  line-height: 1.4;
  padding: 20px;

body {
  margin-left: auto;
  margin-right: auto;
  max-width: 600px;

p {
  margin: 0;

h1 {
  font-size: 48px;
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 10px;
  margin-top: 0;
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