Pen Settings



CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs 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 its URL and the proper URL extension.

+ 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.


Auto Save

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.


                a(href="#").coolBeans hover me


                @import url("")
  box-sizing border-box

  background-color indigo
  display flex
  align-items center
  justify-content center
  height 100vh
  width 100vw
  border 2px solid currentColor
  border-radius 3rem
  color yellow
  font-family roboto
  font-size 4rem
  font-weight 100
  overflow hidden
  padding 1rem 2rem
  position relative
  text-decoration none
  transition .2s transform ease-in-out
  will-change transform
  z-index 0
    background-color yellow
    border-radius 3rem
    content: ''
    display block
    height 100%
    width 100%
    position absolute
    left 0
    top 0
    transform translate(-100%, 0) rotate(10deg)
    transform-origin top left
    transition .2s transform ease-out
    will-change transform
    z-index -1
    transform translate(0, 0)
    border 2px solid transparent
    color indigo
    transform scale(1.05)
    will-change transform