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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).

Add External Stylesheets/Pens

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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.

Add External Scripts/Pens

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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.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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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About Packages

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 

              
                <body>
  <div class="container">
    <div class="block">
      <p>Fusce et euismod sapien. Integer consequat auctor enim, nec molestie magna congue at. Nunc nibh justo, semper ac rutrum eget, fermentum sed nibh. Mauris sit amet porta mi. Pellentesque tellus lectus, hendrerit non lacinia sed, aliquet at risus. Ut porta aliquet eleifend. Integer a mi sed est sodales ornare sed vitae neque.</p>
    </div>
    <div class="block">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque dignissim, tellus vitae venenatis gravida, lacus tortor fringilla nisl, sollicitudin facilisis risus elit et justo. Pellentesque feugiat odio ut porta interdum. Nunc varius est vel ultricies suscipit. Curabitur ut mauris sit amet orci dictum mattis. Maecenas et diam et odio rutrum dapibus ut vel ante. Vestibulum lobortis odio sed vulputate volutpat. Suspendisse rhoncus augue non lorem blandit, quis semper massa posuere. Donec rutrum pretium magna, et faucibus sem porta ac. Vestibulum nec mi eu dolor luctus laoreet quis sed nisl. Maecenas molestie velit volutpat euismod commodo.
      </p>
    </div>
    <div class="block">
      <p>Donec consectetur magna neque, non pulvinar dolor rutrum quis. Sed tincidunt magna dignissim, laoreet tortor non, porttitor arcu. Vestibulum sit amet condimentum erat. Curabitur varius pulvinar dui ac finibus. Curabitur ut est ac nisl ultricies sollicitudin mollis nec enim. Ut vestibulum viverra mollis. Fusce condimentum massa lacus, vitae fermentum sapien iaculis quis. Sed ullamcorper dictum nisi, nec finibus nisl pulvinar vel. Vestibulum et laoreet leo.
      </p>
    </div>
    <div class="block">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque dignissim, tellus vitae venenatis gravida, lacus tortor fringilla nisl, sollicitudin facilisis risus elit et justo. Pellentesque feugiat odio ut porta interdum. Nunc varius est vel ultricies suscipit. Curabitur ut mauris sit amet orci dictum mattis. Maecenas et diam et odio rutrum dapibus ut vel ante. Vestibulum lobortis odio sed vulputate volutpat. Suspendisse rhoncus augue non lorem blandit, quis semper massa posuere. Donec rutrum pretium magna, et faucibus sem porta ac. Vestibulum nec mi eu dolor luctus laoreet quis sed nisl. Maecenas molestie velit volutpat euismod commodo.
      </p>
    </div>
    <div class="block">
      <p>Fusce et euismod sapien. Integer consequat auctor enim, nec molestie magna congue at. Nunc nibh justo, semper ac rutrum eget, fermentum sed nibh. Mauris sit amet porta mi. Pellentesque tellus lectus, hendrerit non lacinia sed, aliquet at risus. Ut porta aliquet eleifend. Integer a mi sed est sodales ornare sed vitae neque.</p>
    </div>
    <div class="block">
      <p>
        Quisque interdum, nisl vel commodo ullamcorper, arcu dui iaculis augue, vel gravida odio justo nec lectus. Cras magna enim, ornare id placerat finibus, molestie nec justo. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Suspendisse consectetur sed justo et fermentum. Ut consectetur augue porta sem elementum commodo. Integer et mollis purus. Praesent tempor arcu eu suscipit aliquam. Morbi felis sapien, varius ut nibh non, ullamcorper sagittis diam. Duis ex enim, suscipit a sagittis in, pharetra ac magna. Vestibulum at facilisis orci.
      </p>
    </div>
    <div class="block">
      <p>Donec consectetur magna neque, non pulvinar dolor rutrum quis. Sed tincidunt magna dignissim, laoreet tortor non, porttitor arcu. Vestibulum sit amet condimentum erat. Curabitur varius pulvinar dui ac finibus. Curabitur ut est ac nisl ultricies sollicitudin mollis nec enim. Ut vestibulum viverra mollis. Fusce condimentum massa lacus, vitae fermentum sapien iaculis quis. Sed ullamcorper dictum nisi, nec finibus nisl pulvinar vel. Vestibulum et laoreet leo.
      </p>
    </div>
    <div class="block">
      <p>
        Quisque interdum, nisl vel commodo ullamcorper, arcu dui iaculis augue, vel gravida odio justo nec lectus. Cras magna enim, ornare id placerat finibus, molestie nec justo. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Suspendisse consectetur sed justo et fermentum. Ut consectetur augue porta sem elementum commodo. Integer et mollis purus. Praesent tempor arcu eu suscipit aliquam. Morbi felis sapien, varius ut nibh non, ullamcorper sagittis diam. Duis ex enim, suscipit a sagittis in, pharetra ac magna. Vestibulum at facilisis orci.
      </p>
    </div>

  </div>

</body>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Ubuntu);
body {
  font-family: 'Ubuntu';
  color: #fff;
  margin: 40px;
}
.container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}
.block {
  padding: 0.5em 1.5em 0.5em 1.5em;
  border-radius: 10px;
}

.block:nth-of-type(3n+1) {
    background: #4C3A51;
}
.block:nth-of-type(3n+2) {
    background: #774360;
}
.block:nth-of-type(3n+3) {
    background: #B25068;
}
!

JS
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999px

Console