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HTML

About HTML Preprocessors

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.

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

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

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HTML 

              
                <section>
  <h2>Lorem ipsum dolor sit amet</h2>
  <p>Aenean in libero sit amet leo porta dapibus eget ac magna. Mauris eleifend diam rutrum eros ullamcorper pretium. Duis ac felis vitae leo viverra imperdiet. Donec erat libero, venenatis non leo sed, aliquet accumsan ipsum. Etiam rutrum blandit est, quis ultrices nunc hendrerit ut. Vestibulum quis blandit nibh, ut congue tortor. Integer ut enim sed est ultrices pellentesque. Integer neque nisi, auctor id orci at, blandit imperdiet mauris. Aliquam erat volutpat. Vestibulum vel est non risus tincidunt vulputate. Fusce in nisi a dolor molestie venenatis ac a nunc. Ut tincidunt tincidunt leo, rhoncus blandit massa molestie in.</p>
<p>Curabitur consectetur lorem justo, ut tempus sem finibus vel. Quisque facilisis auctor aliquam. Aliquam mauris sem, suscipit vel mi in, scelerisque auctor sem. Duis laoreet justo sit amet leo commodo ultrices. Mauris ante eros, lacinia in sapien et, laoreet maximus neque. Curabitur aliquam dui nec ante congue, ac auctor lacus bibendum. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed interdum odio suscipit vehicula fermentum. Vestibulum est ante, consectetur a euismod a, euismod ac sapien. Aenean tincidunt lacinia odio vel ullamcorper.</p>
<p>Phasellus vel fringilla ligula. Curabitur vitae dui nisl. Aliquam aliquam ac massa nec congue. Donec laoreet nunc vitae dolor sollicitudin vulputate. Sed sem nunc, vestibulum ut ex ut, accumsan eleifend diam. Proin quis diam ut est finibus fermentum. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec cursus urna at congue fermentum. Phasellus id purus vel eros cursus volutpat nec sit amet justo. Aenean dapibus vel arcu eget porta. Ut purus est, aliquet quis venenatis eu, pretium non felis. Cras ligula elit, fringilla sit amet lacinia sed, ornare eu turpis. Ut et mauris a orci pretium lobortis. Fusce mattis nunc non eros porttitor mattis.</p>
</section>


<section>
  <h2>Curabitur consectetur lorem justo</h2>
  <p>Aenean in libero sit amet leo porta dapibus eget ac magna. Mauris eleifend diam rutrum eros ullamcorper pretium. Duis ac felis vitae leo viverra imperdiet. Donec erat libero, venenatis non leo sed, aliquet accumsan ipsum. Etiam rutrum blandit est, quis ultrices nunc hendrerit ut. Vestibulum quis blandit nibh, ut congue tortor. Integer ut enim sed est ultrices pellentesque. Integer neque nisi, auctor id orci at, blandit imperdiet mauris. Aliquam erat volutpat. Vestibulum vel est non risus tincidunt vulputate. Fusce in nisi a dolor molestie venenatis ac a nunc. Ut tincidunt tincidunt leo, rhoncus blandit massa molestie in.</p>
<p>Curabitur consectetur lorem justo, ut tempus sem finibus vel. Quisque facilisis auctor aliquam. Aliquam mauris sem, suscipit vel mi in, scelerisque auctor sem. Duis laoreet justo sit amet leo commodo ultrices. Mauris ante eros, lacinia in sapien et, laoreet maximus neque. Curabitur aliquam dui nec ante congue, ac auctor lacus bibendum. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed interdum odio suscipit vehicula fermentum. Vestibulum est ante, consectetur a euismod a, euismod ac sapien. Aenean tincidunt lacinia odio vel ullamcorper.</p>
<p>Phasellus vel fringilla ligula. Curabitur vitae dui nisl. Aliquam aliquam ac massa nec congue. Donec laoreet nunc vitae dolor sollicitudin vulputate. Sed sem nunc, vestibulum ut ex ut, accumsan eleifend diam. Proin quis diam ut est finibus fermentum. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec cursus urna at congue fermentum. Phasellus id purus vel eros cursus volutpat nec sit amet justo. Aenean dapibus vel arcu eget porta. Ut purus est, aliquet quis venenatis eu, pretium non felis. Cras ligula elit, fringilla sit amet lacinia sed, ornare eu turpis. Ut et mauris a orci pretium lobortis. Fusce mattis nunc non eros porttitor mattis.</p>
</section>



<section>
  <h2>Phasellus vel fringilla ligula</h2>
  <p>Aenean in libero sit amet leo porta dapibus eget ac magna. Mauris eleifend diam rutrum eros ullamcorper pretium. Duis ac felis vitae leo viverra imperdiet. Donec erat libero, venenatis non leo sed, aliquet accumsan ipsum. Etiam rutrum blandit est, quis ultrices nunc hendrerit ut. Vestibulum quis blandit nibh, ut congue tortor. Integer ut enim sed est ultrices pellentesque. Integer neque nisi, auctor id orci at, blandit imperdiet mauris. Aliquam erat volutpat. Vestibulum vel est non risus tincidunt vulputate. Fusce in nisi a dolor molestie venenatis ac a nunc. Ut tincidunt tincidunt leo, rhoncus blandit massa molestie in.</p>
<p>Curabitur consectetur lorem justo, ut tempus sem finibus vel. Quisque facilisis auctor aliquam. Aliquam mauris sem, suscipit vel mi in, scelerisque auctor sem. Duis laoreet justo sit amet leo commodo ultrices. Mauris ante eros, lacinia in sapien et, laoreet maximus neque. Curabitur aliquam dui nec ante congue, ac auctor lacus bibendum. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Sed interdum odio suscipit vehicula fermentum. Vestibulum est ante, consectetur a euismod a, euismod ac sapien. Aenean tincidunt lacinia odio vel ullamcorper.</p>
<p>Phasellus vel fringilla ligula. Curabitur vitae dui nisl. Aliquam aliquam ac massa nec congue. Donec laoreet nunc vitae dolor sollicitudin vulputate. Sed sem nunc, vestibulum ut ex ut, accumsan eleifend diam. Proin quis diam ut est finibus fermentum. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec cursus urna at congue fermentum. Phasellus id purus vel eros cursus volutpat nec sit amet justo. Aenean dapibus vel arcu eget porta. Ut purus est, aliquet quis venenatis eu, pretium non felis. Cras ligula elit, fringilla sit amet lacinia sed, ornare eu turpis. Ut et mauris a orci pretium lobortis. Fusce mattis nunc non eros porttitor mattis.</p>
</section>
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CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Varela+Round);

body {
  font-family: 'Varela Round', sans-serif;
  letter-spacing: .05em;
}

h2 {
  position: -webkit-sticky; /* Safari */
  position: sticky;
  top: 0;
  padding: 10px;
  background: #fff;
  border-bottom: 5px solid #00507E;
}
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JS
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999px

Console