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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.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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

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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

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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 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.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                  <div class="header">
    <h1>My big company!</h1>
  </div>
  <ul class="menu">
    <li><a href="#">Home</a></li><li>
    <a href="#">Services</a></li><li>
    <a href="#">Portfolio</a></li><li>
    <a href="#">About</a></li>
  </ul>
  <div class="container">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent luctus urna sit amet sollicitudin venenatis. Aenean odio tortor, varius vitae molestie eu, ultricies vel lacus. Nam viverra fermentum dapibus. Nulla at semper diam. Phasellus sit amet hendrerit sapien, non semper felis. Morbi augue leo, mattis nec leo sed, malesuada porta dui. Maecenas pretium eros quis lorem luctus gravida.</p>

    <p>Sed gravida quam odio, euismod accumsan mauris ornare quis. Duis sed condimentum justo. Phasellus ac dui eget velit bibendum viverra. Aenean porttitor commodo diam, quis interdum mi sagittis lobortis. Donec id ipsum dignissim, pharetra nunc sit amet, porttitor elit. Donec iaculis elit et enim interdum, ac laoreet lorem consequat. Sed eu elit ut quam pellentesque cursus. Integer sed condimentum est. Integer tempor placerat bibendum. Sed ut semper arcu, at porttitor nibh. Fusce vulputate pharetra tellus a laoreet. Cras imperdiet enim sed turpis adipiscing placerat. Vestibulum ut rhoncus mauris. In egestas ullamcorper dolor vitae suscipit. Curabitur non orci rutrum, iaculis ligula quis, sollicitudin neque. Aliquam dapibus dignissim tincidunt.</p>

    <p>Suspendisse at urna mauris. Vivamus eu lectus et quam viverra accumsan quis nec ligula. Aliquam sed mi sit amet arcu convallis bibendum id eu lorem. Sed pretium eget nibh egestas consectetur. Sed adipiscing, libero sed molestie laoreet, arcu tortor elementum ligula, nec commodo ipsum augue ut tellus. Morbi nibh mauris, facilisis vel bibendum vehicula, dignissim in tortor. Suspendisse augue urna, vestibulum at orci nec, scelerisque cursus mi. Proin congue eget justo et mattis.</p>

    <p>Suspendisse suscipit in lectus at aliquet. Integer non sem enim. Vestibulum aliquam imperdiet laoreet. In malesuada sodales augue, ut aliquam elit tempus id. Suspendisse sed hendrerit nibh. Curabitur molestie in libero nec vulputate. Cras ut scelerisque lacus, vitae cursus dui. Fusce ultricies lectus tincidunt, congue elit interdum, pellentesque nunc.</p>
    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>
    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>

    <p>Donec quis diam dapibus, accumsan ipsum vitae, porta turpis. Pellentesque vel ligula suscipit, scelerisque justo sit amet, vestibulum enim. Morbi eget sapien blandit, mattis enim sed, tincidunt eros. Nullam urna lectus, pretium id ultrices non, convallis vitae arcu. Fusce vel justo in nulla pulvinar interdum id sed sem. Ut quis ullamcorper dolor, a bibendum quam. Vivamus pellentesque, enim feugiat tempus venenatis, arcu quam molestie eros, quis bibendum nulla metus vitae nisi. Integer at lectus at metus eleifend molestie. Nulla sit amet pharetra est. Sed commodo ac leo ac volutpat. Vivamus enim sapien, sodales vel cursus sit amet, ornare at risus. Proin a lacus id felis aliquet fringilla.</p>
</div>
!

CSS 

              
                body {
   margin: 0; 
}

.header {
    height: 100px;
    background-color: #ddcbaf;
    text-align: center;
}

.header h1 {
    margin-top: 0;
    padding-top: 20px;
}

.menu {
    margin: 0;
    padding: 0;
    width: 100%;
    background-color: #BFFFF3;
    top: 0;
    position: -webkit-sticky;
    position: sticky;
}

.menu li {
    display: inline-block;
    text-align: center;
    width: 25%;
}

.menu li:hover,
.menu li:focus {
    background-color: #66FFE3;
}

.menu a {
    display: block;
    padding: 10px 0;
    text-decoration: none;
}

.sticky {
    top: 0;
    position: fixed;
}

.container {
  padding: 0 20px;
  color: #989898;
}
!

JS 

              
                // Demo by Aurelio De Rosa (@AurelioDeRosa)
// See article: http://www.sitepoint.com/css-position-sticky-introduction-polyfills/

// Browsers may require a flag to be enabled or vendor prefix
// See: http://caniuse.com/#feat=css-sticky
!
999px

Console