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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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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></div>
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CSS 

              
                div {
  height: 600px;
  width: 300px;
  background: green;
  border-radius: 40px;
  border: 3px solid #503c24;
  background-image: radial-gradient(ellipse closest-corner at 50% 204px, #d2c6b9 24px, transparent 14.5px), radial-gradient(ellipse closest-corner at 50% 170px, #503c24 9px, transparent 9px), radial-gradient(circle at 80px 26px, #000 4px, transparent 4.5px), radial-gradient(circle at 58px 24px, #9edcf9 1px, #71d2ff 3px, transparent 4px), radial-gradient(circle at 57px 28px, #03a9f4 1px, blue 4px, transparent 4px), radial-gradient(circle at 58px 26px, #00005a 6px, transparent 6px), radial-gradient(circle at 58px 26px, #4e4e4e 8px, transparent 8px), radial-gradient(circle at 58px 26px, black 12px, transparent 12px), radial-gradient(circle at 97px 26px, #fffce3 7px, #dac834 7px, #dac834 8px, #d2c6b9 8px, #d2c6b9 15px, transparent 15px), radial-gradient(ellipse closest-side at 60px 65px, #d2c6b9 50px, transparent 50px), radial-gradient(ellipse closest-side at 45px 37px, #d2c6b9 32px, transparent 32px), radial-gradient(ellipse closest-side at 130px 37px, #d2c6b9 41px, transparent 41px), radial-gradient(ellipse closest-side at 177px 37px, #d2c6b9 41px, transparent 41px), radial-gradient(ellipse closest-side at 242px 37px, #d2c6b9 41px, transparent 41px), radial-gradient(ellipse closest-side at 242px 565px, #d2c6b9 40px, transparent 40px), radial-gradient(ellipse closest-side at 170px 565px, #d2c6b9 41px, transparent 41px), radial-gradient(ellipse closest-side at 130px 565px, #d2c6b9 41px, transparent 41px), radial-gradient(ellipse closest-side at 49px 565px, #d2c6b9 34px, transparent 32px), radial-gradient(ellipse closest-side at 60px 535px, #d2c6b9 50px, transparent 50px), radial-gradient(circle at 42px 42px, #d2c6b9 32px, transparent 32px), radial-gradient(circle at 42px 42px, #fff 40px, transparent 40px), radial-gradient(circle at 256px 42px, #d2c6b9 32px, transparent 32px), radial-gradient(circle at 256px 42px, #fff 40px, transparent 40px), radial-gradient(circle at 256px 558px, #d2c6b9 32px, transparent 32px), radial-gradient(circle at 256px 558px, #fff 40px, transparent 40px), radial-gradient(circle at 42px 558px, #d2c6b9 32px, transparent 32px), radial-gradient(circle at 42px 558px, #fff 40px, transparent 40px), 
    
    linear-gradient(to right, rgba(115, 107, 98, .4) 1px, rgba(253, 247, 240, .2) 6px, #fdf7f0 10px, #d2c6b9 15px, #d2c6b9 37px, transparent 37px, transparent 263px, #d2c6b9 263px, #d2c6b9 285px, #fdf7f0 290px, rgba(253, 247, 240, .2) 294px, rgba(115, 107, 98, .4) 299px), 
    
    linear-gradient(to bottom, transparent 3.5px, #fff 3.5px, #fff 11px, transparent 11px, transparent 37px, white 37px, white 45px, transparent 45px, transparent 563px, white 563px, white 571px, transparent 571px, transparent 589px, white 589px, white 596.5px, transparent 596.5px), radial-gradient(circle at 150px 97px, transparent 22px, #d2c6b9 22px), radial-gradient(circle at 170px 117px, #fdf7f0 22px, #d2c6b9 22px), radial-gradient(15px at 181px 135px, #d2c6b9 0%, #d2c6b9 14px, rgba(0, 0, 0, 1) 14px, rgba(0, 0, 0, 0) 14px);
  box-shadow: -145px 11px 0 -140px #fff, -144px 10px 0 -140px #503c24, -145px 10px 0 -140px #fff, -143px -28px 0 -140px #d2c6b9, -144px -30px 0 -140px #503c24, 154px 47px 0 -150px #fff, 153px 46px 0 -150px #503c24, 152px 11px 0 -150px #d2c6b9, 153px 10px 0 -150px #503c24, 154px -2px 0 -150px #fff, 153px -3px 0 -150px #503c24, 152px -36px 0 -150px #d2c6b9, 153px -37px 0 -150px #503c24, 154px -53px 0 -150px #fff, 153px -54px 0 -150px #503c24, 152px -76px 0 -150px #d2c6b9, 153px -77px 0 -150px #503c24;
}

div:before {
  content: '\A\A\A\A\A\A\A\A\A\A\A\A\A\A\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0\000a0iPhone';
  white-space: pre;
  color: rgba(80, 60, 36, .6);
  font-size: 25px;
  font-family: sans-serif;
  height: 518px;
  width: 300px;
  background: transparent;
  position: absolute;
  top: 56px;
  left: 11px;
  z-index: 9999;
  background-image: radial-gradient(ellipse closest-side at 45% 100px, violet 12px, transparent 12px), linear-gradient(to right, rgba(115, 107, 98, .5) 1px, rgba(253, 247, 240, .5) 4px, #fdf7f0 8px, #d2c6b9 11px, #d2c6b9 37px, #d2c6b9 80px, transparent 80px, transparent 215px, #d2c6b9 215px, #d2c6b9 264px, #d2c6b9 286px, #fdf7f0 291px, rgba(253, 247, 240, .2) 295px, rgba(115, 107, 98, .4) 299px);
}

div:after {
  content: '';
  font-size: 8px;
  color: red;
  height: 55px;
  width: 40px;
  background: green;
  background-image: radial-gradient(circle at 45px 18px, #d2c6b9 14px, transparent 14px), linear-gradient(66deg, #503c24 29px, transparent 29px), linear-gradient(25deg, #503c24 20px, #fdf7f0 46px, #fdf7f0 59px);
  position: absolute;
  top: 130px;
  left: 151px;
  z-index: 9999;
  border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
  box-shadow: -20px 0 0 0 #503c24;
}
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JS
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999px

Console