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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

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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-.

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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

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 esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

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HTML 

              
                <div class="panel">
  <div class="content">
    <h1>One of those modern, fixed-background layouts</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nemo nihil pariatur tempora quaerat veritatis aut, error ullam soluta ea ducimus blanditiis expedita reprehenderit vero dolor iste sapiente, rerum deleniti excepturi.</p>
  </div>
</div>

<div class="panel">
  <div class="content">
    <h2>Here is where we say we handcraft our code</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nemo nihil pariatur tempora quaerat veritatis aut, error ullam soluta ea ducimus blanditiis expedita reprehenderit vero dolor iste sapiente, rerum deleniti excepturi.</p>
  </div>
</div>

<div class="panel">
  <div class="content">
    <h2>And this is where we say we're code ninjas and font nerds</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nemo nihil pariatur tempora quaerat veritatis aut, error ullam soluta ea ducimus blanditiis expedita reprehenderit vero dolor iste sapiente, rerum deleniti excepturi.</p>
  </div>
</div>

<div class="panel">
  <div class="content">
    <h2>Man, I wish I could afford a Macbook</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nemo nihil pariatur tempora quaerat veritatis aut, error ullam soluta ea ducimus blanditiis expedita reprehenderit vero dolor iste sapiente, rerum deleniti excepturi.</p>
  </div>
</div>

<div class="panel">
  <div class="content">
    <h2>Why do designers like antlers so much?</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nemo nihil pariatur tempora quaerat veritatis aut, error ullam soluta ea ducimus blanditiis expedita reprehenderit vero dolor iste sapiente, rerum deleniti excepturi.</p>
  </div>
</div>
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CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:300);
* {
  box-sizing: border-box;
}
html {
  line-height: 1.8;
  font-size: 13px;
  background: #000;
  font-family: Lato, sans-serif;
}

h1,h2,h3,h4,h5,h6 {
  line-height: 1.2;
  text-transform: uppercase;
  letter-spacing: .2em;
}

.panel {
  min-height: 90vh;
  margin: 20px;
  background: url(https://unsplash.it/g/900/900) no-repeat 50% 50%;
  background-size: cover;
  background-attachment: fixed;
  display: flex;
  padding: 2em;
  justify-content: center;
  align-items: center;
  
  &:nth-child(2) {
    background-image: url(https://unsplash.it/g/901/600);
  }
  &:nth-child(3) {
    background-image: url(https://unsplash.it/g/900/601);
  }
  &:nth-child(4) {
    background-image: url(https://unsplash.it/g/900/601?image=0);
  }
  &:nth-child(5) {
    background-image: url(https://unsplash.it/g/900/601?image=577);
  }}

.content {
  max-width: 400px;
  text-align: center;
  padding: 2em;
  background: rgba(#000,.8);
  border: 1px dashed #888;
  box-shadow: 0 0 0 10px rgba(#000,.8);
  color: #fff;
  *:first-child {
    margin-top: 0;
  }
  *:last-child {
    margin-bottom: 0;
  }
  h1, h2 {
    padding-bottom: 1em;
    border-bottom: 1px dashed #888;
  }
}
!

JS
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999px

Console