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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                .container
  input#tab-1(type='radio', name='tabs', checked)
  input#tab-2(type='radio', name='tabs')
  input#tab-3(type='radio', name='tabs')
  input#tab-4(type='radio', name='tabs')
  .tabs
    label(for='tab-1') Really
    label(for='tab-2') Awesome
    label(for='tab-3') CSS-only
    label(for='tab-4') Tabs
  .content
    .tab
      h3 Lanyard belay parley spyglass.
      p
        | Parrel ho galleon handsomely cutlass piracy hang the jib smartly pirate. Hornswaggle come about boom execution dock quarter barque bilged on her anchor fire ship Cat o'nine tails. Swing the lead pinnace carouser hulk Sail ho hornswaggle blow the man down Buccaneer Arr. List lanyard brig squiffy sloop Sea Legs no prey, no pay barque trysail. Jack gun heave to haul wind hail-shot fore carouser broadside Yellow Jack.
      p
        | Provost jury mast gaff man-of-war lanyard haul wind overhaul yawl chase. Gunwalls quarterdeck square-rigged lad Corsair tackle weigh anchor line Sink me. Wherry swing the lead bilge rutters cable poop deck rope's end avast pirate. Marooned Barbary Coast main sheet gangway lad brig chantey gally crow's nest. Port sutler ahoy scurvy clipper bilge water reef sails American Main bring a spring upon her cable.
    .tab
      h3 Red ensign loaded to the gunwalls Davy Jones' Locker.
      p
        | Boatswain square-rigged rope's end fathom barkadeer gabion pinnace. Scuttle topgallant interloper bilge water Sea Legs hardtack league. Barbary Coast cackle fruit rigging poop deck quarterdeck bucko ahoy. Blimey topgallant Pieces of Eight ye landlubber or just lubber loaded to the gunwalls spike.

    .tab
      h3 Pirate Ipsum
      p
        | Pirate Ipsum from 
        a(href='http://idsgn.dropmark.com/107/1313404') here
        |.
      p
        | Sea Legs transom port spanker heave to prow chandler. Line scallywag cackle fruit swing the lead scuppers wherry lateen sail. Coxswain barkadeer code of conduct jack wench bring a spring upon her cable to go on account.
    .tab
      h3 Ho black jack prow
      p
        | Run a shot across the bow strike colors hang the jib man-of-war gun lookout Nelsons folly holystone jury mast skysail. Plunder jib Blimey run a rig scallywag lookout line tack Brethren of the Coast bilge water. Square-rigged sheet spyglass Sail ho barkadeer Privateer piracy plunder gun belaying pin. Splice the main brace gaff grog clipper fore Plate Fleet scourge of the seven seas me lanyard yardarm.
      p
        | Lad gangway league draught Spanish Main tack gally flogging handsomely prow. Barbary Coast pinnace lad scuttle fathom shrouds pirate wherry interloper yo-ho-ho. Mizzenmast gibbet hang the jib smartly Admiral of the Black yo-ho-ho square-rigged avast code of conduct bilged on her anchor. Keel bilge rat hang the jib lugger reef driver trysail Nelsons folly schooner wherry. 
      p
        | Jib capstan boatswain rutters scuttle lugsail nipper starboard loot hail-shot. Transom barque hearties chantey skysail gunwalls wherry Letter of Marque blow the man down landlubber or just lubber. Bounty rum Buccaneer wench draft bucko chantey ho Sink me hogshead. Blow the man down keel log trysail jolly boat pinnace come about hearties grapple nipperkin.
      p
        | Take a caulk dance the hempen jig Cat o'nine tails mizzen lateen sail pink aye to go on account warp bowsprit.
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CSS 

              
                @import 'https://fonts.googleapis.com/css?family=Roboto:400,700';

$tabs: 4;
$color: #242B36;
$brand: #D22C3F;

*, :before, :after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: rgba(#000,0);
}

body {
  background: $brand;
  font-family: Roboto;
}

input[name="tabs"] {
  display: none;
  @for $i from 1 through $tabs {
    &#tab-#{$i}:checked {
      ~ .content .tab:nth-of-type(#{$i}) {
        display: inline-block;
      }
      ~ .tabs label:nth-child(#{$i}) {
        color: #242b36;
        &:after {
          width: calc(100% - 40px);
          transition: .3s;
        }
      }
    }
  }
}

.tabs {
  box-shadow: 0 20px 50px -25px rgba(0, 0, 0, .3);
  overflow-X: auto;
  -webkit-overflow-scrolling: touch;
  position: relative;
  white-space: nowrap;
  label {
    display: inline-block;
    padding: 18px;
    position: relative;
    color: lighten($color, 60%);
    font-weight: 700;
    font-size: 20px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    cursor: pointer;
    &:after {
      content: '';
      background: $brand;
      width: 0;
      height: 4px;
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      transition: .1s;
    }
  }
}

.container {
  background: #FFF;
  width: 90%;
  border-radius: 3px;
  box-shadow: 0 50px 75px -25px rgba(0, 0, 0, .3);
  margin: 25px auto;
  overflow: hidden;
  .tab {
    display: none;
    background: #F6F6F6;
    padding: 0 20px;
  }
}
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JS
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999px

Console