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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 URL's 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 it's URL and the proper URL extention.

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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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Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

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Code Indentation

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HTML
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CSS 

              
                html {
    height: 100%;
}

body {
    margin: 0;
    height: 100%;
    background: #010001;
background: -moz-linear-gradient(left,  #010001 0%, #010002 7%, #080102 7%, #080102 8%, #010101 8%, #010001 12%, #3b0403 12%, #3b0403 13%, #020001 13%, #010001 17%, #050f0d 17%, #050f0d 18%, #130003 19%, #130003 20%, #190104 20%, #190104 22%, #070103 22%, #070103 24%, #2e0201 24%, #2e0201 25%, #380404 25%, #380404 27%, #010001 27%, #010001 29%, #57330e 29%, #57330e 30%, #1b0504 30%, #1b0504 32%, #020001 32%, #010001 35%, #0d0203 35%, #0d0203 37%, #411c15 37%, #411c15 39%, #041310 39%, #041310 40%, #0c0204 40%, #0c0204 42%, #020002 42%, #020002 44%, #1c0102 44%, #1c0102 45%, #5f1715 45%, #5f1715 47%, #ee5c58 47%, #ee5c58 49%, #471012 49%, #471012 50%, #82081f 50%, #82081f 52%, #fc5694 52%, #fc5694 54%, #c22c86 54%, #c22c86 55%, #5f2d6c 56%, #5f2d6c 57%, #20132d 57%, #20132d 59%, #010001 59%, #010001 64%, #020106 64%, #020106 66%, #092cc4 66%, #092dc0 69%, #06138c 69%, #06138c 71%, #0b39ed 71%, #0b39ed 72%, #0947fe 72%, #0947fe 74%, #0a53f7 74%, #0a53f7 76%, #1485f9 76%, #1485f9 77%, #108bfa 77%, #108bfa 79%, #040732 79%, #040732 81%, #071c71 81%, #071c71 82%, #051253 82%, #051253 84%, #030209 84%, #030209 86%, #010001 86%, #010001 87%, #050f48 87%, #050f48 89%, #0928a9 89%, #0928a9 91%, #010001 91%, #010001 96%, #041d64 96%, #041d64 98%, #051760 98%, #051760 99%, #010001 99%, #010001 100%);
background: -webkit-linear-gradient(left,  #010001 0%,#010002 7%,#080102 7%,#080102 8%,#010101 8%,#010001 12%,#3b0403 12%,#3b0403 13%,#020001 13%,#010001 17%,#050f0d 17%,#050f0d 18%,#130003 19%,#130003 20%,#190104 20%,#190104 22%,#070103 22%,#070103 24%,#2e0201 24%,#2e0201 25%,#380404 25%,#380404 27%,#010001 27%,#010001 29%,#57330e 29%,#57330e 30%,#1b0504 30%,#1b0504 32%,#020001 32%,#010001 35%,#0d0203 35%,#0d0203 37%,#411c15 37%,#411c15 39%,#041310 39%,#041310 40%,#0c0204 40%,#0c0204 42%,#020002 42%,#020002 44%,#1c0102 44%,#1c0102 45%,#5f1715 45%,#5f1715 47%,#ee5c58 47%,#ee5c58 49%,#471012 49%,#471012 50%,#82081f 50%,#82081f 52%,#fc5694 52%,#fc5694 54%,#c22c86 54%,#c22c86 55%,#5f2d6c 56%,#5f2d6c 57%,#20132d 57%,#20132d 59%,#010001 59%,#010001 64%,#020106 64%,#020106 66%,#092cc4 66%,#092dc0 69%,#06138c 69%,#06138c 71%,#0b39ed 71%,#0b39ed 72%,#0947fe 72%,#0947fe 74%,#0a53f7 74%,#0a53f7 76%,#1485f9 76%,#1485f9 77%,#108bfa 77%,#108bfa 79%,#040732 79%,#040732 81%,#071c71 81%,#071c71 82%,#051253 82%,#051253 84%,#030209 84%,#030209 86%,#010001 86%,#010001 87%,#050f48 87%,#050f48 89%,#0928a9 89%,#0928a9 91%,#010001 91%,#010001 96%,#041d64 96%,#041d64 98%,#051760 98%,#051760 99%,#010001 99%,#010001 100%);
background: linear-gradient(to right,  #010001 0%,#010002 7%,#080102 7%,#080102 8%,#010101 8%,#010001 12%,#3b0403 12%,#3b0403 13%,#020001 13%,#010001 17%,#050f0d 17%,#050f0d 18%,#130003 19%,#130003 20%,#190104 20%,#190104 22%,#070103 22%,#070103 24%,#2e0201 24%,#2e0201 25%,#380404 25%,#380404 27%,#010001 27%,#010001 29%,#57330e 29%,#57330e 30%,#1b0504 30%,#1b0504 32%,#020001 32%,#010001 35%,#0d0203 35%,#0d0203 37%,#411c15 37%,#411c15 39%,#041310 39%,#041310 40%,#0c0204 40%,#0c0204 42%,#020002 42%,#020002 44%,#1c0102 44%,#1c0102 45%,#5f1715 45%,#5f1715 47%,#ee5c58 47%,#ee5c58 49%,#471012 49%,#471012 50%,#82081f 50%,#82081f 52%,#fc5694 52%,#fc5694 54%,#c22c86 54%,#c22c86 55%,#5f2d6c 56%,#5f2d6c 57%,#20132d 57%,#20132d 59%,#010001 59%,#010001 64%,#020106 64%,#020106 66%,#092cc4 66%,#092dc0 69%,#06138c 69%,#06138c 71%,#0b39ed 71%,#0b39ed 72%,#0947fe 72%,#0947fe 74%,#0a53f7 74%,#0a53f7 76%,#1485f9 76%,#1485f9 77%,#108bfa 77%,#108bfa 79%,#040732 79%,#040732 81%,#071c71 81%,#071c71 82%,#051253 82%,#051253 84%,#030209 84%,#030209 86%,#010001 86%,#010001 87%,#050f48 87%,#050f48 89%,#0928a9 89%,#0928a9 91%,#010001 91%,#010001 96%,#041d64 96%,#041d64 98%,#051760 98%,#051760 99%,#010001 99%,#010001 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#010001', endColorstr='#010001',GradientType=1 );

}
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JS
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999px

Console