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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Babel includes JSX processing.

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

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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Auto-Updating Preview

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

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

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Visit your global Editor Settings.


                <p><strong>Default!</strong> Lorem ipsum, dolor sit amet consectetur adipisicing elit. Fugiat placeat qui praesentium. Earum itaque architecto laboriosam voluptates beatae dolore molestiae quas magni quo non vel doloribus, accusamus repellendus quaerat aut!</p>
<p><strong>Contain!</strong> Perspiciatis dolorum corporis minus soluta! Culpa aspernatur non facilis porro. Magni qui cumque eligendi ducimus neque dolor minima, provident quod nihil? Nostrum deleniti laudantium illum corporis iure quasi error earum?</p>


                p {
  height: 100px;
  width: 100px;
  overflow: scroll;
  margin: 20px;

p:nth-child(2) {
  overscroll-behavior: contain;

body {
  display: flex;
  padding: 20px;
  min-height: 200vh;