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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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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

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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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Packages

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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Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div class="frame">
  <div class="center">
    <div class="number">
      <div class="one-one"></div>
      <div class="one-two"></div>
      <div class="zero-one"></div>
      <div class="zero-two"></div>
    </div>
    <span class="big">Days</span>
    <span class="small">CSS Challenge</span>
  </div>
</div>
!

CSS 

              
                
.frame {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  height: 400px;
  margin-top: -200px;
  margin-left: -200px;
  border-radius: 2px;
  box-shadow: 1px 2px 10px 0px rgba(0,0,0,0.3);
  background: #43389F;
  background: -webkit-linear-gradient(bottom left, #43389F 0%, #4ec6ca 100%);
  background: -moz-linear-gradient(bottom left, #43389F 0%, #4ec6ca 100%);
  background: -o-linear-gradient(bottom left, #43389F 0%, #4ec6ca 100%);
  background: linear-gradient(to top right, #43389F 0%, #4ec6ca 100%); 
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#43389F', endColorstr='#4ec6ca',GradientType=1 ); 
  font-family: 'Courier New', 'Courier', sans-serif;
  color: #fff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.center {
  position: absolute;
  top: 50.8%;
  left: 50.5%;
  transform: translate(-50%,-50%);
}

.number {
  position: relative;
  height: 100px;
  width: 200px;

  .one-one {
    position: absolute;
    z-index: 1;
    top: 0;
    left: -16px;
    height: 40px;
    width: 20px;
    background: #fff;
    border-radius: 3px;
    transform: rotate(50deg);
    box-shadow: 0 0 13px 0 rgba(0,0,0,0.2);
  }

  .one-two {
    position: absolute;
    z-index: 10;
    top: 0;
    left: 0px;
    height: 100px;
    width: 24px;
    background: #fff;
    border-radius: 3px;
    box-shadow: 0 0 13px 0 rgba(0,0,0,0.2);
  }

  .zero-one, 
  .zero-two {
    position: absolute;
    z-index: 8;
    top: 0;
    left: 17px;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
    border-radius: 50%;
    border: 24px solid #fff;
    box-shadow: 0 0 13px 0 rgba(0,0,0,0.2);
  }

  .zero-two {
    z-index: 6;
    left: 100px;
  }
}

.big {
  position: relative;
  z-index: 20;
  display: block;
  font-size: 82px;
  line-height: 60px;
  text-transform: uppercase;
  font-weight: 700;
  margin-top: 6px;
}

.small {
  position: relative;
  z-index: 20;
  display: block; 
  font-size: 23px;
  line-height: 20px;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: .04em;
}
!

JS
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999px

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