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. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource


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.

+ add another resource


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.



Go PRO Window blinds lowered to protect code. Code Editor with window blinds (raised) and a light blub turned on.

Keep it secret; keep it safe.

Private Pens are hidden everywhere on CodePen, except to you. You can still share them and other people can see them, they just can't find them through searching or browsing.

Upgrade to PRO


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.

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

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.


Make Template?

Templates are Pens that can be used to start other Pens quickly from the create menu. The new Pen will copy all the code and settings from the template and make a new Pen (that is not a fork). You can view all of your templates, or learn more in the documentation.

Template URL

Any Pen can act as a template (even if you don't flip the toggle above) with a special URL you can use yourself or share with others. Here's this Pen's template URL:


Screenshot or Custom Thumbnail

Screenshots of Pens are shown in mobile browsers, RSS feeds, to users who chose images instead of iframes, and in social media sharing.

This Pen is using the default Screenshot, generated by CodePen. Upgrade to PRO to upload your own thumbnail that will be displayed on previews of this pen throughout the site and when sharing to social media.

Upgrade to PRO


                <div class="gradient">


                div {
  height: 100px;
  background-color: red;
      to right, 
      #000000 1px,
      #ffff00 1px,
      #ffff00 100px,

      #000000 100px,
      #000000 101px,
      #ffff00 101px,
      #ffff00 200px,
      #000000 200px,
      #000000 201px,
      #ffff00 201px,
      #ffff00 300px,
      #000000 300px,
      #000000 301px,
      #ffff00 301px,
      #ffff00 400px,
      #000000 400px,
      #000000 401px,
      #ffff00 401px,
      #ffff00 500px,
      #000000 500px,
      #000000 501px,
      #ffff00 501px,
      #ffff00 600px,
      #000000 600px,
      #000000 601px,
      #ffff00 601px,
      #ffff00 700px,
      #000000 700px,
      #000000 701px,
      #ffff00 701px,
      #ffff00 800px,
      #000000 800px,
      #000000 801px,
      #ffff00 801px,
      #ffff00 900px,
      #000000 900px,
      #000000 901px,
      #ffff00 901px,
      #ffff00 1000px,
      #000000 1000px,
      #000000 1001px,
      #ffff00 1001px,
      #ffff00 1100px,
      #000000 1100px,
      #000000 1101px,
      #ffff00 1101px,
      #ffff00 1200px,
      #000000 1200px,
      #000000 1201px,
      #ffff00 1201px,
      #ffff00 1300px,
      #000000 1300px,
      #000000 1301px,
      #ffff00 1301px,
      #ffff00 1400px


There are 10 kinds of people, those who understand binary and those who don’t.