Pen Settings

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.

Learn more · Versions

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.

Powered by Algolia
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.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

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.

Powered by Algolia
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.

Learn more

+ add another resource

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.

Powered by Algolia
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

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

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

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                <div class="kitty"></div>
!

CSS 

              
                body {
  background-color: lightblue;
}

.kitty {
  width: 20px;
  height: 20px;
  margin: 0 auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: (translate(-50%, -50%));
  background-color: white;
  box-shadow: 
    /* 1st row starts */
    20px 0 #b4b4b4, 40px 0 white, 60px 0 white, 80px 0 black, 100px 0 black, 120px 0 #b4b4b4, 140px 0 white, 160px 0 white, 180px 0 white, 200px 0 white, 220px 0 white, 240px 0 black, 260px 0 black, 280px 0 black, 300px 0 black, -20px 0 #b4b4b4, -40px 0 #b4b4b4, -60px 0 #b4b4b4, -80px 0 #b4b4b4, -100px 0 black, -120px 0 #b4b4b4, -140px 0 #61615f, -160px 0 black, -180px 0 black, -200px 0 #61615f, -220px 0 #61615f, -240px 0 #61615f, -260px 0 black,
  /* 2nd row starts */
    0 -20px #b4b4b4, 20px -20px black, 40px -20px #b4b4b4, 60px -20px black, 80px -20px black, 100px -20px black, 120px -20px #b4b4b4, 140px -20px white, 160px -20px white, 180px -20px white, 200px -20px #61615f, 220px -20px #61615f, 240px -20px white, 260px -20px white, 280px -20px #b4b4b4, 300px -20px transparent, -20px -20px #b4b4b4, -40px -20px #b4b4b4, -60px -20px #61615f, -80px -20px #61615f, -100px -20px black, -120px -20px black, -140px -20px black, -160px -20px black, -180px -20px #61615f, -200px -20px #61615f, -220px -20px #61615f, -240px -20px #b4b4b4, -260px -20px #b4b4b4, -280px -20px black,
    /* 3rd row starts */
    0 -40px #b4b4b4, 20px -40px black, 40px -40px black, 60px -40px black, 80px -40px black, 100px -40px black, 120px -40px #b4b4b4, 140px -40px white, 160px -40px white, 180px -40px #b4b4b4, 200px -40px black, 220px -40px black, 240px -40px white, 260px -40px black, 280px -40px black, 300px -40px black, -20px -40px #b4b4b4, -40px -40px #61615f, -60px -40px #61615f, -80px -40px #61615f, -100px -40px black, -120px -40px transparent, -140px -40px transparent, -160px -40px transparent, -180px -40px black, -200px -40px #b4b4b4, -220px -40px #b4b4b4, -240px -40px #b4b4b4, -260px -40px #61615f, -280px -40px black,
    /* 4th row starts */
    0 -60px #b4b4b4, 20px -60px #b4b4b4, 40px -60px black, 60px -60px black, 80px -60px black, 100px -60px #b4b4b4, 120px -60px #b4b4b4, 140px -60px #b4b4b4, 160px -60px #b4b4b4, 180px -60px #b4b4b4, 200px -60px white, 220px -60px black, 240px -60px white, 260px -60px black, -20px -60px #b4b4b4, -40px -60px black, -60px -60px black, -80px -60px black, -100px -60px black, -120px -60px transparent, -140px -60px transparent, -160px -60px transparent, -180px -60px transparent, -200px -60px black, -220px -60px #61615f, -240px -60px #61615f, -260px -60px #61615f, -280px -60px black,
    /* 5th row starts */
    0 -80px black, 20px -80px black, 40px -80px #b4b4b4, 60px -80px #b4b4b4, 80px -80px #b4b4b4, 100px -80px #b4b4b4, 120px -80px #b4b4b4, 140px -80px #b4b4b4, 160px -80px #b4b4b4, 180px -80px #b4b4b4, 200px -80px black, 220px -80px black, 240px -80px #b4b4b4, 260px -80px black, -20px -80px black, -40px -80px black, -60px -80px #ecc0d1, -80px -80px black, -100px -80px black, -120px -80px black, -140px -80px transparent, -160px -80px transparent, -180px -80px transparent, -200px -80px black, -220px -80px #61615f, -240px -80px #61615f, -260px -80px #61615f, -280px -80px black,
    /* 6th row starts */
    0 -100px black, 20px -100px black, 40px -100px #b4b4b4, 60px -100px #b4b4b4, 80px -100px #b4b4b4, 100px -100px #b4b4b4, 120px -100px #b4b4b4, 140px -100px #b4b4b4, 160px -100px #b4b4b4, 180px -100px #b4b4b4, 200px -100px black, 220px -100px black, 240px -100px black, 260px -100px black, -20px -100px black, -40px -100px #ecc0d1, -60px -100px #ecc0d1, -80px -100px #ecc0d1, -100px -100px black, -120px -100px black, -140px -100px transparent, -160px -100px transparent, -180px -100px transparent, -200px -100px black, -220px -100px #b4b4b4, -240px -100px #b4b4b4, -260px -100px #61615f, -280px -100px black,
    /* 7th row starts */
    0 -120px black, 20px -120px #b4b4b4, 40px -120px #b4b4b4, 60px -120px #b4b4b4, 80px -120px #b4b4b4, 100px -120px #b4b4b4, 120px -120px #b4b4b4, 140px -120px #b4b4b4, 160px -120px #b4b4b4, 180px -120px #b4b4b4, 200px -120px #b4b4b4, 220px -120px black, 240px -120px black, 260px -120px black, -20px -120px black, -40px -120px #ecc0d1, -60px -120px #ecc0d1, -80px -120px #ecc0d1, -100px -120px #ecc0d1, -120px -120px black, -140px -120px black, -160px -120px transparent, -180px -120px transparent, -200px -120px black, -220px -120px #61615f, -240px -120px #61615f, -260px -120px #b4b4b4, -280px -120px black,
    /* 8th row starts */
    0 -140px black, 20px -140px #61615f, 40px -140px #b4b4b4, 60px -140px #b4b4b4, 80px -140px #b4b4b4, 100px -140px #61615f, 120px -140px #b4b4b4, 140px -140px #b4b4b4, 160px -140px #b4b4b4, 180px -140px #b4b4b4, 200px -140px #b4b4b4, 220px -140px #b4b4b4, 240px -140px black, 260px -140px black, -20px -140px black, -40px -140px black, -60px -140px #ecc0d1, -80px -140px #ecc0d1, -100px -140px #ecc0d1, -120px -140px black, -140px -140px black, -160px -140px transparent, -180px -140px transparent, -200px -140px black, -220px -140px #61615f, -240px -140px #61615f, -260px -140px #61615f, -280px -140px black,
    /* 9th row starts */
    0 -160px #61615f, 20px -160px #61615f, 40px -160px #b4b4b4, 60px -160px #b4b4b4, 80px -160px #61615f, 100px -160px #61615f, 120px -160px #b4b4b4, 140px -160px #b4b4b4, 160px -160px #61615f, 180px -160px #b4b4b4, 200px -160px #b4b4b4, 220px -160px #b4b4b4, 240px -160px black, 260px -160px black, -20px -160px black, -40px -160px black, -60px -160px black, -80px -160px #ecc0d1, -100px -160px #ecc0d1, -120px -160px #61615f, -140px -160px black, -160px -160px black, -180px -160px black, -200px -160px #61615f, -220px -160px #b4b4b4, -240px -160px #b4b4b4, -260px -160px #b4b4b4, -280px -160px black,
    /* 10th row starts */
    0 -180px #61615f, 20px -180px #61615f, 40px -180px #b4b4b4, 60px -180px #61615f, 80px -180px #61615f, 100px -180px #b4b4b4, 120px -180px #b4b4b4, 140px -180px #b4b4b4, 160px -180px #61615f, 180px -180px #b4b4b4, 200px -180px #b4b4b4, 220px -180px black, 240px -180px black, 260px -180px black, -20px -180px black, -40px -180px black, -60px -180px black, -80px -180px black, -100px -180px black, -120px -180px #61615f, -140px -180px black, -160px -180px black, -180px -180px black, -200px -180px #61615f, -220px -180px #b4b4b4, -240px -180px #b4b4b4, -260px -180px black,
    /* 11th row starts */
    0 -200px #61615f, 20px -200px #b4b4b4, 40px -200px #61615f, 60px -200px #61615f, 80px -200px #61615f, 100px -200px #61615f, 120px -200px #b4b4b4, 140px -200px #61615f, 160px -200px #61615f, 180px -200px #61615f, 200px -200px black, 220px -200px black, 240px -200px #61615f, 260px -200px black, -20px -200px #61615f, -40px -200px #61615f, -60px -200px black, -80px -200px black, -100px -200px #61615f, -120px -200px #61615f, -140px -200px black, -160px -200px black, -180px -200px #b4b4b4, -200px -200px #b4b4b4, -220px -200px #61615f, -240px -200px #b4b4b4, -260px -200px black,
    /* 12th row starts */
    0 -220px black, 20px -220px black, 40px -220px black, 60px -220px #61615f, 80px -220px #61615f, 100px -220px #61615f, 120px -220px #61615f, 140px -220px #61615f, 160px -220px #61615f, 180px -220px black, 200px -220px black, 220px -220px black, 240px -220px #61615f, 260px -220px black, -20px -220px black, -40px -220px black, -60px -220px #61615f, -80px -220px #61615f, -100px -220px #61615f, -120px -220px #61615f, -140px -220px black, -160px -220px black, -180px -220px #b4b4b4, -200px -220px #b4b4b4, -220px -220px #b4b4b4, -240px -220px black,
    /* 13th row starts */
    0 -240px transparent, 20px -240px transparent, 40px -240px transparent, 60px -240px black, 80px -240px black, 100px -240px black, 120px -240px black, 140px -240px black, 160px -240px black, 180px -240px black, 200px -240px black, 220px -240px #61615f, 240px -240px #61615f, 260px -240px black, -20px -240px transparent, -40px -240px transparent, -60px -240px black, -80px -240px black, -100px -240px black, -120px -240px black, -140px -240px black, -160px -240px black, -180px -240px #b4b4b4, -200px -240px #b4b4b4, -220px -240px #b4b4b4, -240px -240px black,
    /* 14th row starts */
    140px -260px black, 160px -260px black, 180px -260px black, 200px -260px black, 220px -260px #61615f, 240px -260px #61615f, 260px -260px black, -180px -260px black, -200px -260px black, -220px -260px black,
    /* 15th row starts */
    160px -280px black, 180px -280px black, 200px -280px black, 220px -280px #61615f, 240px -280px black,
    /* 16th row starts */
    0 20px white, 20px 20px white, 40px 20px white, 60px 20px black, 80px 20px black, 100px 20px black, 120px 20px white, 140px 20px white, 160px 20px #b4b4b4, 180px 20px #b4b4b4, 200px 20px white, 220px 20px white, 240px 20px white, 260px 20px black, -20px 20px #b4b4b4, -40px 20px #61615f, -60px 20px #61615f, -80px 20px #61615f, -100px 20px black, -120px 20px #b4b4b4, -140px 20px #b4b4b4, -160px 20px #61615f, -180px 20px #61615f, -200px 20px black, -220px 20px #61615f, -240px 20px #61615f, -260px 20px black,
    /* 17th row starts */
    0 40px #61615f, 20px 40px #b4b4b4, 40px 40px white, 60px 40px black, 80px 40px black, 100px 40px white, 120px 40px white, 140px 40px white, 160px 40px black, 180px 40px black, 200px 40px white, 220px 40px white, 240px 40px black, 260px 40px black, -20px 40px #61615f, -40px 40px #b4b4b4, -60px 40px #b4b4b4, -80px 40px #61615f, -100px 40px #61615f, -120px 40px #61615f, -140px 40px #b4b4b4, -160px 40px #b4b4b4, -180px 40px #61615f, -200px 40px #61615f, -220px 40px black, -240px 40px black,
    /* 18th row starts */
    0 60px white, 20px 60px white, 40px 60px white, 60px 60px white, 80px 60px white, 100px 60px white, 120px 60px white, 140px 60px white, 160px 60px white, 180px 60px white, 200px 60px white, 220px 60px black, 240px 60px black, -20px 60px white, -40px 60px #b4b4b4, -60px 60px #b4b4b4, -80px 60px #b4b4b4, -100px 60px #b4b4b4, -120px 60px #61615f, -140px 60px #61615f, -160px 60px #b4b4b4, -180px 60px #b4b4b4, -200px 60px #61615f, -220px 60px #b4b4b4, -240px 60px black,
    /* 19th row starts */
    0 80px #61615f, 20px 80px #61615f, 40px 80px #61615f, 60px 80px white, 80px 80px white, 100px 80px white, 120px 80px white, 140px 80px white, 160px 80px white, 180px 80px white, 200px 80px black, 220px 80px black, -20px 80px #b4b4b4, -40px 80px #b4b4b4, -60px 80px #b4b4b4, -80px 80px #b4b4b4, -100px 80px #b4b4b4, -120px 80px #61615f, -140px 80px #61615f, -160px 80px #b4b4b4, -180px 80px #b4b4b4, -200px 80px #b4b4b4, -220px 80px #b4b4b4, -240px 80px #61615f, -260px 80px black,
    /* 20th row starts */
    0 100px #b4b4b4, 20px 100px #b4b4b4, 40px 100px white, 60px 100px white, 80px 100px white, 100px 100px white, 120px 100px white, 140px 100px white, 160px 100px black, 180px 100px black, 200px 100px black, -20px 100px #b4b4b4, -40px 100px #b4b4b4, -60px 100px #61615f, -80px 100px #b4b4b4, -100px 100px #b4b4b4, -120px 100px #b4b4b4, -140px 100px #61615f, -160px 100px #b4b4b4, -180px 100px #b4b4b4, -200px 100px #b4b4b4, -220px 100px #b4b4b4, -240px 100px #61615f, -260px 100px black,
    /* 21st row starts */
    0 120px #61615f, 20px 120px #b4b4b4, 40px 120px #b4b4b4, 60px 120px #b4b4b4, 80px 120px #b4b4b4, 100px 120px #b4b4b4, 120px 120px #b4b4b4, 140px 120px #61615f, 160px 120px #61615f, 180px 120px black, -20px 120px #61615f, -40px 120px #b4b4b4, -60px 120px #61615f, -80px 120px #b4b4b4, -100px 120px #b4b4b4, -120px 120px #b4b4b4, -140px 120px #61615f, -160px 120px #b4b4b4, -180px 120px #b4b4b4, -200px 120px #b4b4b4, -220px 120px #61615f, -240px 120px #61615f, -260px 120px black,
    /* 22nd row starts */
    0 140px #61615f, 20px 140px #61615f, 40px 140px #b4b4b4, 60px 140px #b4b4b4, 80px 140px white, 100px 140px #b4b4b4, 120px 140px #61615f, 140px 140px #61615f, 160px 140px #61615f, 180px 140px #b4b4b4, 200px 140px black, -20px 140px #61615f, -40px 140px #b4b4b4, -60px 140px #b4b4b4, -80px 140px #b4b4b4, -100px 140px #b4b4b4, -120px 140px #b4b4b4, -140px 140px #61615f, -160px 140px #b4b4b4, -180px 140px #b4b4b4, -200px 140px #b4b4b4, -220px 140px #61615f, -240px 140px #61615f, -260px 140px black,
    /* 23rd row starts */
    0 160px #61615f, 20px 160px #61615f, 40px 160px black, 60px 160px white, 80px 160px white, 100px 160px black, 120px 160px #b4b4b4, 140px 160px #b4b4b4, 160px 160px #b4b4b4, 180px 160px #b4b4b4, 200px 160px black, -20px 160px #b4b4b4, -40px 160px #b4b4b4, -60px 160px #b4b4b4, -80px 160px #b4b4b4, -100px 160px white, -120px 160px white, -140px 160px white, -160px 160px #b4b4b4, -180px 160px #b4b4b4, -200px 160px #61615f, -220px 160px #61615f, -240px 160px #61615f, -260px 160px #61615f, -280px 160px black,
    /* 24th row starts */
    0 180px #b4b4b4, 20px 180px #b4b4b4, 40px 180px black, 60px 180px white, 80px 180px #b4b4b4, 100px 180px black, 120px 180px white, 140px 180px white, 160px 180px white, 180px 180px white, 200px 180px #b4b4b4, 220px 180px black, -20px 180px #b4b4b4, -40px 180px #b4b4b4, -60px 180px #b4b4b4, -80px 180px white, -100px 180px white, -120px 180px white, -140px 180px white, -160px 180px #b4b4b4, -180px 180px #b4b4b4, -200px 180px #b4b4b4, -220px 180px #b4b4b4, -240px 180px #61615f, -260px 180px #61615f, -280px 180px black,
    /* 25th row starts */
    0 200px white, 20px 200px #b4b4b4, 40px 200px black, 60px 200px black, 80px 200px black, 100px 200px black, 120px 200px white, 140px 200px white, 160px 200px white, 180px 200px white, 200px 200px white, 220px 200px black, -20px 200px #b4b4b4, -40px 200px white, -60px 200px black, -80px 200px black, -100px 200px black, -120px 200px #b4b4b4, -140px 200px white, -160px 200px #b4b4b4, -180px 200px #b4b4b4, -200px 200px #b4b4b4, -220px 200px #b4b4b4, -240px 200px #b4b4b4, -260px 200px white, -280px 200px black,
    /* 26th row starts */
    0 220px white, 20px 220px white, 40px 220px white, 60px 220px black, 80px 220px transparent, 100px 220px transparent, 120px 220px black, 140px 220px white, 160px 220px white, 180px 220px #b4b4b4, 200px 220px white, 220px 220px black, -20px 220px white, -40px 220px black, -60px 220px transparent, -80px 220px transparent, -100px 220px transparent, -120px 220px black, -140px 220px black, -160px 220px black, -180px 220px #b4b4b4, -200px 220px white, -220px 220px white, -240px 220px white, -260px 220px white, -280px 220px black,
    /* 27th row starts */
    0 240px white, 20px 240px white, 40px 240px white, 60px 240px white, 80px 240px black, 100px 240px transparent, 120px 240px black, 140px 240px #b4b4b4, 160px 240px #b4b4b4, 180px 240px white, 200px 240px white, 220px 240px black, -20px 240px #b4b4b4, -40px 240px black, -60px 240px transparent, -80px 240px transparent, -100px 240px transparent, -120px 240px black, -140px 240px black, -160px 240px black, -180px 240px black, -200px 240px white, -220px 240px white, -240px 240px white, -260px 240px white, -280px 240px black,
    /* 28th row starts */
    0 260px white, 20px 260px #b4b4b4, 40px 260px #b4b4b4, 60px 260px white, 80px 260px black, 100px 260px transparent, 120px 260px transparent, 140px 260px black, 160px 260px black, 180px 260px black, 200px 260px black, -20px 260px black, -200px 260px black, -220px 260px white, -240px 260px white, -260px 260px white, -280px 260px black,
    /* 29th row starts */
    0 280px #b4b4b4, 20px 280px #b4b4b4, 40px 280px white, 60px 280px black, -20px 280px black, -220px 280px black, -240px 280px black, -260px 280px black;
}
!

JS
!
999px

Console