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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.

Learn more · Versions

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="main">
  <div class="sidebar">
    <div class="sticky">
      <h2>This is a sticky sidebar with too much content - it doesn't stick</h2>
      <ul>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
      </ul>
        <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vestibulum, nisl sit amet tincidunt consectetur, ex enim volutpat nulla, eu dignissim sapien felis quis lectus. Proin condimentum a libero nec vulputate. Cras euismod nisl porta mattis ullamcorper. Vivamus hendrerit cursus ante non mollis. Duis feugiat sodales massa id facilisis. Cras rhoncus velit diam, ut iaculis mi tempor sit amet. Phasellus non ipsum fringilla, facilisis ante at, venenatis metus. Curabitur non ante ac dui porta tempor. Pellentesque ornare sem a lacus tristique luctus in vel ante. Nunc faucibus sed est fermentum hendrerit.</p>
       <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vestibulum, nisl sit amet tincidunt consectetur, ex enim volutpat nulla, eu dignissim sapien felis quis lectus. Proin condimentum a libero nec vulputate. Cras euismod nisl porta mattis ullamcorper. Vivamus hendrerit cursus ante non mollis. Duis feugiat sodales massa id facilisis. Cras rhoncus velit diam, ut iaculis mi tempor sit amet. Phasellus non ipsum fringilla, facilisis ante at, venenatis metus. Curabitur non ante ac dui porta tempor. Pellentesque ornare sem a lacus tristique luctus in vel ante. Nunc faucibus sed est fermentum hendrerit.</p>
       <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vestibulum, nisl sit amet tincidunt consectetur, ex enim volutpat nulla, eu dignissim sapien felis quis lectus. Proin condimentum a libero nec vulputate. Cras euismod nisl porta mattis ullamcorper. Vivamus hendrerit cursus ante non mollis. Duis feugiat sodales massa id facilisis. Cras rhoncus velit diam, ut iaculis mi tempor sit amet. Phasellus non ipsum fringilla, facilisis ante at, venenatis metus. Curabitur non ante ac dui porta tempor. Pellentesque ornare sem a lacus tristique luctus in vel ante. Nunc faucibus sed est fermentum hendrerit.</p>
          <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vestibulum, nisl sit amet tincidunt consectetur, ex enim volutpat nulla, eu dignissim sapien felis quis lectus. Proin condimentum a libero nec vulputate. Cras euismod nisl porta mattis ullamcorper. Vivamus hendrerit cursus ante non mollis. Duis feugiat sodales massa id facilisis. Cras rhoncus velit diam, ut iaculis mi tempor sit amet. Phasellus non ipsum fringilla, facilisis ante at, venenatis metus. Curabitur non ante ac dui porta tempor. Pellentesque ornare sem a lacus tristique luctus in vel ante. Nunc faucibus sed est fermentum hendrerit.</p>
          <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vestibulum, nisl sit amet tincidunt consectetur, ex enim volutpat nulla, eu dignissim sapien felis quis lectus. Proin condimentum a libero nec vulputate. Cras euismod nisl porta mattis ullamcorper. Vivamus hendrerit cursus ante non mollis. Duis feugiat sodales massa id facilisis. Cras rhoncus velit diam, ut iaculis mi tempor sit amet. Phasellus non ipsum fringilla, facilisis ante at, venenatis metus. Curabitur non ante ac dui porta tempor. Pellentesque ornare sem a lacus tristique luctus in vel ante. Nunc faucibus sed est fermentum hendrerit.</p>
          <p>
        Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris vestibulum, nisl sit amet tincidunt consectetur, ex enim volutpat nulla, eu dignissim sapien felis quis lectus. Proin condimentum a libero nec vulputate. Cras euismod nisl porta mattis ullamcorper. Vivamus hendrerit cursus ante non mollis. Duis feugiat sodales massa id facilisis. Cras rhoncus velit diam, ut iaculis mi tempor sit amet. Phasellus non ipsum fringilla, facilisis ante at, venenatis metus. Curabitur non ante ac dui porta tempor. Pellentesque ornare sem a lacus tristique luctus in vel ante. Nunc faucibus sed est fermentum hendrerit.</p>
      
    </div>
  </div>
  <div class="sidebar">
    <div class="sticky">
      <h2>This is a sticky sidebar, with a small amount of content</h2>
            <ul>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
        <li><a href="#">Page link </a></li>
      </ul>
    </div>
  </div>
  <div class="content">
    <h2>Main content area</h2>
    <p>Pellentesque et cursus eros. Suspendisse magna risus, rutrum eu eleifend vel, tristique quis est. Praesent condimentum bibendum sem, eu rutrum enim tincidunt vitae. Nunc mattis metus mi, vel vehicula nisi finibus quis. Phasellus imperdiet elit vel euismod porttitor. Nam a sem nec orci vestibulum pharetra ac non diam. Etiam dui augue, consectetur vel imperdiet ultricies, pretium eu mauris.</p>

<p>Nunc scelerisque felis eu metus mattis iaculis. Phasellus sit amet finibus mi, at semper ipsum. Maecenas vel nisl sagittis, bibendum massa a, porttitor augue. Nunc eget purus quis urna sodales faucibus pretium id libero. Cras congue dapibus risus, nec placerat augue gravida varius. Vestibulum eu consequat ipsum. In hac habitasse platea dictumst.</p>

<p>Integer vehicula tortor eget felis fermentum, et aliquam erat mollis. Sed rutrum ex orci, vitae suscipit massa suscipit id. Morbi diam erat, auctor tempus pretium at, facilisis non lacus. Etiam ultrices maximus maximus. Sed risus mi, pretium id laoreet nec, sodales nec lectus. Donec ac risus in nisl pharetra ultricies. Morbi dolor quam, sagittis eget felis quis, lobortis pulvinar purus. Aenean rutrum nec quam nec molestie.</p>

<p>Etiam quis posuere felis, a dapibus nunc. Nullam non molestie tellus, id ullamcorper nisl. Curabitur ultrices odio at arcu pharetra, eu ultricies magna sagittis. Ut fringilla mi leo, nec iaculis dui cursus ut. Integer non tellus id ligula efficitur porttitor in eu mauris. Proin interdum gravida sapien, iaculis congue sem placerat non. Suspendisse risus justo, ornare eleifend justo sit amet, ornare ultricies mi.</p>
    
     <p>Pellentesque et cursus eros. Suspendisse magna risus, rutrum eu eleifend vel, tristique quis est. Praesent condimentum bibendum sem, eu rutrum enim tincidunt vitae. Nunc mattis metus mi, vel vehicula nisi finibus quis. Phasellus imperdiet elit vel euismod porttitor. Nam a sem nec orci vestibulum pharetra ac non diam. Etiam dui augue, consectetur vel imperdiet ultricies, pretium eu mauris.</p>

<p>Nunc scelerisque felis eu metus mattis iaculis. Phasellus sit amet finibus mi, at semper ipsum. Maecenas vel nisl sagittis, bibendum massa a, porttitor augue. Nunc eget purus quis urna sodales faucibus pretium id libero. Cras congue dapibus risus, nec placerat augue gravida varius. Vestibulum eu consequat ipsum. In hac habitasse platea dictumst.</p>

<p>Integer vehicula tortor eget felis fermentum, et aliquam erat mollis. Sed rutrum ex orci, vitae suscipit massa suscipit id. Morbi diam erat, auctor tempus pretium at, facilisis non lacus. Etiam ultrices maximus maximus. Sed risus mi, pretium id laoreet nec, sodales nec lectus. Donec ac risus in nisl pharetra ultricies. Morbi dolor quam, sagittis eget felis quis, lobortis pulvinar purus. Aenean rutrum nec quam nec molestie.</p>

<p>Etiam quis posuere felis, a dapibus nunc. Nullam non molestie tellus, id ullamcorper nisl. Curabitur ultrices odio at arcu pharetra, eu ultricies magna sagittis. Ut fringilla mi leo, nec iaculis dui cursus ut. Integer non tellus id ligula efficitur porttitor in eu mauris. Proin interdum gravida sapien, iaculis congue sem placerat non. Suspendisse risus justo, ornare eleifend justo sit amet, ornare ultricies mi.</p>
    
     <p>Pellentesque et cursus eros. Suspendisse magna risus, rutrum eu eleifend vel, tristique quis est. Praesent condimentum bibendum sem, eu rutrum enim tincidunt vitae. Nunc mattis metus mi, vel vehicula nisi finibus quis. Phasellus imperdiet elit vel euismod porttitor. Nam a sem nec orci vestibulum pharetra ac non diam. Etiam dui augue, consectetur vel imperdiet ultricies, pretium eu mauris.</p>

<p>Nunc scelerisque felis eu metus mattis iaculis. Phasellus sit amet finibus mi, at semper ipsum. Maecenas vel nisl sagittis, bibendum massa a, porttitor augue. Nunc eget purus quis urna sodales faucibus pretium id libero. Cras congue dapibus risus, nec placerat augue gravida varius. Vestibulum eu consequat ipsum. In hac habitasse platea dictumst.</p>

<p>Integer vehicula tortor eget felis fermentum, et aliquam erat mollis. Sed rutrum ex orci, vitae suscipit massa suscipit id. Morbi diam erat, auctor tempus pretium at, facilisis non lacus. Etiam ultrices maximus maximus. Sed risus mi, pretium id laoreet nec, sodales nec lectus. Donec ac risus in nisl pharetra ultricies. Morbi dolor quam, sagittis eget felis quis, lobortis pulvinar purus. Aenean rutrum nec quam nec molestie.</p>

<p>Etiam quis posuere felis, a dapibus nunc. Nullam non molestie tellus, id ullamcorper nisl. Curabitur ultrices odio at arcu pharetra, eu ultricies magna sagittis. Ut fringilla mi leo, nec iaculis dui cursus ut. Integer non tellus id ligula efficitur porttitor in eu mauris. Proin interdum gravida sapien, iaculis congue sem placerat non. Suspendisse risus justo, ornare eleifend justo sit amet, ornare ultricies mi.</p>
    
     <p>Pellentesque et cursus eros. Suspendisse magna risus, rutrum eu eleifend vel, tristique quis est. Praesent condimentum bibendum sem, eu rutrum enim tincidunt vitae. Nunc mattis metus mi, vel vehicula nisi finibus quis. Phasellus imperdiet elit vel euismod porttitor. Nam a sem nec orci vestibulum pharetra ac non diam. Etiam dui augue, consectetur vel imperdiet ultricies, pretium eu mauris.</p>

<p>Nunc scelerisque felis eu metus mattis iaculis. Phasellus sit amet finibus mi, at semper ipsum. Maecenas vel nisl sagittis, bibendum massa a, porttitor augue. Nunc eget purus quis urna sodales faucibus pretium id libero. Cras congue dapibus risus, nec placerat augue gravida varius. Vestibulum eu consequat ipsum. In hac habitasse platea dictumst.</p>

<p>Integer vehicula tortor eget felis fermentum, et aliquam erat mollis. Sed rutrum ex orci, vitae suscipit massa suscipit id. Morbi diam erat, auctor tempus pretium at, facilisis non lacus. Etiam ultrices maximus maximus. Sed risus mi, pretium id laoreet nec, sodales nec lectus. Donec ac risus in nisl pharetra ultricies. Morbi dolor quam, sagittis eget felis quis, lobortis pulvinar purus. Aenean rutrum nec quam nec molestie.</p>

<p>Etiam quis posuere felis, a dapibus nunc. Nullam non molestie tellus, id ullamcorper nisl. Curabitur ultrices odio at arcu pharetra, eu ultricies magna sagittis. Ut fringilla mi leo, nec iaculis dui cursus ut. Integer non tellus id ligula efficitur porttitor in eu mauris. Proin interdum gravida sapien, iaculis congue sem placerat non. Suspendisse risus justo, ornare eleifend justo sit amet, ornare ultricies mi.</p>
    
     <p>Pellentesque et cursus eros. Suspendisse magna risus, rutrum eu eleifend vel, tristique quis est. Praesent condimentum bibendum sem, eu rutrum enim tincidunt vitae. Nunc mattis metus mi, vel vehicula nisi finibus quis. Phasellus imperdiet elit vel euismod porttitor. Nam a sem nec orci vestibulum pharetra ac non diam. Etiam dui augue, consectetur vel imperdiet ultricies, pretium eu mauris.</p>

<p>Nunc scelerisque felis eu metus mattis iaculis. Phasellus sit amet finibus mi, at semper ipsum. Maecenas vel nisl sagittis, bibendum massa a, porttitor augue. Nunc eget purus quis urna sodales faucibus pretium id libero. Cras congue dapibus risus, nec placerat augue gravida varius. Vestibulum eu consequat ipsum. In hac habitasse platea dictumst.</p>

<p>Integer vehicula tortor eget felis fermentum, et aliquam erat mollis. Sed rutrum ex orci, vitae suscipit massa suscipit id. Morbi diam erat, auctor tempus pretium at, facilisis non lacus. Etiam ultrices maximus maximus. Sed risus mi, pretium id laoreet nec, sodales nec lectus. Donec ac risus in nisl pharetra ultricies. Morbi dolor quam, sagittis eget felis quis, lobortis pulvinar purus. Aenean rutrum nec quam nec molestie.</p>

<p>Etiam quis posuere felis, a dapibus nunc. Nullam non molestie tellus, id ullamcorper nisl. Curabitur ultrices odio at arcu pharetra, eu ultricies magna sagittis. Ut fringilla mi leo, nec iaculis dui cursus ut. Integer non tellus id ligula efficitur porttitor in eu mauris. Proin interdum gravida sapien, iaculis congue sem placerat non. Suspendisse risus justo, ornare eleifend justo sit amet, ornare ultricies mi.</p>
  </div>
</div>
!

CSS 

              
                .main {
  display: flex;
  
  .sidebar {
    width: 15%;


    .sticky {
        position: -webkit-sticky;
        position: sticky;
        top: 0;
        padding: 20px;
    }
  }
  
  .content {
    width: 60%;
    padding: 20px;
  }
  
  p {
    font-size: 16px;
    font-family: Arial;
    line-height: 28px;
  }
}
!

JS
!
999px

Console