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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

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.

Behavior

Auto Save

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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

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

Editor Settings

Code Indentation

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Visit your global Editor Settings.

HTML 

              
                
<form method="POST" action="/subscribe" enctype="application/x-www-form-urlencoded" target="_blank">
  <input type="text"><!-- text input -->
  <input type="text" value="Prefilled value">
</form>







<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Rubik:400,700">
!

CSS 

              
                * {
  margin: 0;
  font-family: Rubik;
  color: rgb(255 255 255);
  -webkit-font-smoothing: antialiased;
}

html {
  font-size: 62.5%;
}

body {
  display: flex;
  min-height: 100vh;
  place-items: center;
  place-content: center;
  background: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' version='1.1' xmlns:xlink='http://www.w3.org/1999/xlink' xmlns:svgjs='http://svgjs.com/svgjs' width='1440' height='560' preserveAspectRatio='none' viewBox='0 0 1440 560'%3e%3cg mask='url(%26quot%3b%23SvgjsMask1001%26quot%3b)' fill='none'%3e%3crect width='1440' height='560' x='0' y='0' fill='rgba(94%2c 25%2c 230%2c 1)'%3e%3c/rect%3e%3cpath d='M0%2c621.649C113.342%2c603.155%2c203.835%2c529.574%2c299.667%2c466.291C394.245%2c403.837%2c500.562%2c352.715%2c556.518%2c254.153C614.871%2c151.37%2c619.785%2c29.716%2c614.558%2c-88.36C608.879%2c-216.639%2c623.579%2c-372.594%2c525.124%2c-455.023C424.919%2c-538.917%2c269.998%2c-457.102%2c142.092%2c-483.92C28.831%2c-507.667%2c-64.735%2c-630.984%2c-176.822%2c-602.199C-288.639%2c-573.484%2c-326.761%2c-435.738%2c-398.312%2c-345.14C-466.069%2c-259.345%2c-548.911%2c-187.119%2c-585.884%2c-84.237C-628.65%2c34.765%2c-664.248%2c165.208%2c-624.903%2c285.384C-584.01%2c410.289%2c-485.615%2c513.262%2c-369.878%2c575.541C-258.205%2c635.633%2c-125.16%2c642.071%2c0%2c621.649' fill='%234b14b8'%3e%3c/path%3e%3cpath d='M1440 997.543C1528.486 1013.7919999999999 1636.257 1029.5140000000001 1702.893 969.0699999999999 1770.647 907.6120000000001 1734.792 794.21 1760.837 706.521 1782.1109999999999 634.894 1836.342 576.806 1841.541 502.267 1847.517 416.595 1842.002 324.75800000000004 1792.353 254.68400000000003 1741.0059999999999 182.21499999999997 1657.028 134.34199999999998 1569.635 118.505 1486.104 103.368 1407.938 149.781 1325.511 170.086 1238.53 191.51299999999998 1120.201 165.611 1071.969 241.099 1021.9110000000001 319.446 1106.002 419.15 1106.976 512.118 1107.745 585.508 1053.484 656.246 1077.048 725.754 1101.186 796.958 1172.4270000000001 837.643 1232.608 882.7080000000001 1297.167 931.052 1360.672 982.976 1440 997.543' fill='%237e47eb'%3e%3c/path%3e%3c/g%3e%3cdefs%3e%3cmask id='SvgjsMask1001'%3e%3crect width='1440' height='560' fill='white'%3e%3c/rect%3e%3c/mask%3e%3c/defs%3e%3c/svg%3e");
  background-size: cover;
}

* {
  font-size: 1.6rem;
}

form {
  display: grid;
  grid-gap: 2rem;
}

input {
  background: white;
  color: rgb(7 2 18);
  transition: all 200ms ease;
  border-left: 0 solid transparent;
  border: 0;
  height: 5.8rem;
  padding: 0 calc(5.8rem * 0.5);
  border-radius: calc(5.8rem * 0.3);
  box-shadow: 0 0 2rem rgb(0, 0, 0, 20%);
}
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JS
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999px

Console