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.


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.


                - var ok = 2001
  while (ok--)


                magnif = 2
gridbase = 16px*magnif
gridgap = 3px*magnif
  background #000
 display grid
 grid-template-columns repeat(auto-fill,minmax(gridbase, 1fr))
 grid-gap gridgap
 grid-auto-rows minmax(gridbase,max-content)
 grid-auto-flow dense
 text-align center
 vertical-align middle
 background yellow
   background complement(royalblue)
   border-radius 20%
   grid-column auto \/ span 3
   background #00f
  grid-column auto \/ span 5
  background #0f0
   grid-row auto \/ span 2
   background #f00
  grid-row auto \/ span 12
  background #066
   grid-area auto \/ span all \/ auto \/ span all
   background #f0f
   filter invert(1)