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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

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 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.

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

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HTML 

              
                <base href="https://raw-dot-custom-elements.appspot.com/DoubleTrade/custom-scrollbar/0.0.8/custom-scrollbar/">
<script src="../webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="custom-scrollbar.html">
<style is="custom-style">
  div {
    height: 200px;
    width: 100%;
  }
</style>
<div>
  <custom-scrollbar>
    Lorem ipsum dolor sit amet, prompta copiosae partiendo vix ex. Illud nullam mentitum sea in, elitr persius petentium ut mei. Numquam apeirian dissentiunt quo ut. Has in aliquam intellegat. Cum ad habemus rationibus, nostrum dissentiet ius no. Ius in augue
    laboramus, per cu elit illud interpretaris. Reque voluptatibus nam id, id has gloriatur reprehendunt. Quodsi vocent option eam te, id eum omnes probatus. Mel ex corpora pertinax suscipiantur, ceteros insolens eloquentiam ut cum, mei petentium consulatu
    id. Qui ex esse invidunt, et eum ferri facer timeam, cu pri impedit reformidans. Dicam bonorum vix ut, agam posidonium cotidieque ad nam, denique deleniti id duo. Cu inani assueverit nam, eam an inermis signiferumque. Vide maiorum qui ea, sea ex dictas
    civibus, tantas sadipscing eu vix. Te vivendum forensibus eam, has sonet utamur epicurei id, quot aeque quando est cu. Ferri ancillae deseruisse est cu, ut atqui corrumpit sea. Usu te tollit alterum pertinax, ei qui munere molestie voluptatibus, ea
    vel debet option senserit. Tollit commodo maluisset no pri, ex nihil graecis sit. Ne eum animal omittam periculis, et tation scribentur pro. Sit in antiopam vulputate consequuntur, albucius menandri corrumpit sit ei. Quo eros aeque ancillae ut, malorum
    pertinax eam id, an pri facilisis erroribus. Ad mea dolore vivendum, no idque prodesset pri. No postea tamquam delenit nec, elit altera graecis mei eu. An repudiare iracundia has, eum ea tation ceteros tibique. Electram vulputate in qui. Soluta iisque
    eos id, mel probo euismod dignissim at. An vitae intellegat neglegentur vis. Erat voluptua usu cu. Discere meliore postulant ne eam. Ne has vocent tamquam, vel rebum electram inciderint ne. Eu autem fuisset mel. Illum tamquam copiosae ad mei, te usu
    veniam periculis. Oporteat iracundia per te, et cum postulant tractatos omittantur. Praesent expetenda has ex, cu quas euripidis vix. Cu his percipit salutandi interesset. Partem blandit facilisis nam at. Sea ex luptatum singulis. Impetus alienum
    ea sea. Debitis mediocritatem ne his. Fuisset appareat imperdiet quo ne, vis quem causae forensibus ad. Alterum appareat has ea, eu eam viris deleniti appellantur, dicam iracundia persequeris no quo. Cum te labore graeco. Est ceteros expetendis incorrupte
    ad, est no dolorum vocibus. Ut qui velit elitr, ne vis posse complectitur. Id sea abhorreant signiferumque, vel eu omnis choro constituto. Mei ea dicat debet praesent, suas nominavi necessitatibus an sit. No alii laudem constituto has, unum fabellas
    prodesset duo at. Sea alii posse rationibus et, graeci omnium consetetur ne ius. Cibo lorem soluta eum eu, cu vix audire sanctus tacimates, posse utinam mediocrem et usu. Quo ut atqui recteque iudicabit. Error paulo voluptatibus nam eu, ei vim summo
    albucius persecuti. Eu vim aeque moderatius. Ei erant democritum nam, ad quando corpora copiosae vel. Lorem ipsum dolor sit amet, prompta copiosae partiendo vix ex. Illud nullam mentitum sea in, elitr persius petentium ut mei. Numquam apeirian dissentiunt
    quo ut. Has in aliquam intellegat. Cum ad habemus rationibus, nostrum dissentiet ius no. Ius in augue laboramus, per cu elit illud interpretaris. Reque voluptatibus nam id, id has gloriatur reprehendunt. Quodsi vocent option eam te, id eum omnes probatus.
    Mel ex corpora pertinax suscipiantur, ceteros insolens eloquentiam ut cum, mei petentium consulatu id. Qui ex esse invidunt, et eum ferri facer timeam, cu pri impedit reformidans. Dicam bonorum vix ut, agam posidonium cotidieque ad nam, denique deleniti
    id duo. Cu inani assueverit nam, eam an inermis signiferumque. Vide maiorum qui ea, sea ex dictas civibus, tantas sadipscing eu vix. Te vivendum forensibus eam, has sonet utamur epicurei id, quot aeque quando est cu. Ferri ancillae deseruisse est
    cu, ut atqui corrumpit sea. Usu te tollit alterum pertinax, ei qui munere molestie voluptatibus, ea vel debet option senserit. Tollit commodo maluisset no pri, ex nihil graecis sit. Ne eum animal omittam periculis, et tation scribentur pro. Sit in
    antiopam vulputate consequuntur, albucius menandri corrumpit sit ei. Quo eros aeque ancillae ut, malorum pertinax eam id, an pri facilisis erroribus. Ad mea dolore vivendum, no idque prodesset pri. No postea tamquam delenit nec, elit altera graecis
    mei eu. An repudiare iracundia has, eum ea tation ceteros tibique. Electram vulputate in qui. Soluta iisque eos id, mel probo euismod dignissim at. An vitae intellegat neglegentur vis. Erat voluptua usu cu. Discere meliore postulant ne eam. Ne has
    vocent tamquam, vel rebum electram inciderint ne. Eu autem fuisset mel. Illum tamquam copiosae ad mei, te usu veniam periculis. Oporteat iracundia per te, et cum postulant tractatos omittantur. Praesent expetenda has ex, cu quas euripidis vix. Cu
    his percipit salutandi interesset. Partem blandit facilisis nam at. Sea ex luptatum singulis. Impetus alienum ea sea. Debitis mediocritatem ne his. Fuisset appareat imperdiet quo ne, vis quem causae forensibus ad. Alterum appareat has ea, eu eam viris
    deleniti appellantur, dicam iracundia persequeris no quo. Cum te labore graeco. Est ceteros expetendis incorrupte ad, est no dolorum vocibus. Ut qui velit elitr, ne vis posse complectitur. Id sea abhorreant signiferumque, vel eu omnis choro constituto.
    Mei ea dicat debet praesent, suas nominavi necessitatibus an sit. No alii laudem constituto has, unum fabellas prodesset duo at. Sea alii posse rationibus et, graeci omnium consetetur ne ius. Cibo lorem soluta eum eu, cu vix audire sanctus tacimates,
    posse utinam mediocrem et usu. Quo ut atqui recteque iudicabit. Error paulo voluptatibus nam eu, ei vim summo albucius persecuti. Eu vim aeque moderatius. Ei erant democritum nam, ad quando corpora copiosae vel.
  </custom-scrollbar>
</div>
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CSS
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JS
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999px

Console