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="container">
  <div class="head"><h1>CSS Patterns</h1></div>
  <div class="block stripes"></div>
  <div class="block diagonal"></div>
  <div class="block dot"></div>
  <div class="block argyle"></div>
  <div class="block checkerboard"></div>
  <div class="block tartan"></div>
  <div class="block net"></div>
  <div class="block seigaiha"></div>
  <div class="block houndstooth"></div>
  <div class="block flower"></div>
  <div class="block wave"></div>
  <div class="block carbon"></div>
</div>
!

CSS 

              
                * {
  padding: 0;
  margin: 0;
}

body {
  background: black;
  font-family: 'Open Sans', sans-serif;
}

$width: 1100px;

.container {
  margin: 50px auto;
	width:  $width;
  &::after {
    content: "";
    display: block;
    clear: both;
  }
}

.head {
  color: white;
  text-align: center;
  text-shadow: 0 1px 1px rgba(0, 0, 0, .2);
  padding-bottom: 30px;
}

@mixin grid($colNumber, $colGutter) {
  width: ($width - $colGutter * ($colNumber - 1)) / $colNumber;
  height: 220px;
  margin: $colGutter $colGutter 0 0;
  float: left;
  padding: 1px;
  box-sizing: border-box;
  background-clip: content-box;
  border: 5px solid hsla(0, 0%, 100%, .5);
  box-shadow: 0 0 15px 0px rgba(0, 0, 0, .2);
  &:nth-child(#{$colNumber}n + 1){
    margin-right: 0;
  }
}

.block {
  @include grid(3, 10px);
}

.stripes {
  $randomStripColor: hsla(0, 0%, 100%, .1);
  background: grey;
  background-image: 
    linear-gradient(90deg, $randomStripColor 3px, transparent 0),
    linear-gradient(90deg, $randomStripColor 11px, transparent 0),
    linear-gradient(90deg, $randomStripColor 23px, transparent 0);
  background-size: 11px 100%, 21px 100%, 33px 100%;
  background-clip: content-box;
}

.diagonal {
  $lightColor: rgba(255, 255, 255, .5);
  $stripWidth: 15px;
  background-color: grey;
  background-image: 
    repeating-linear-gradient(45deg, 
      transparent,
      transparent $stripWidth, 
      $lightColor $stripWidth, 
      $lightColor ($stripWidth * 2)
    );
}

.dot {
  $size: 40px;
  $dotSize: 10%;
  background-color: grey;
  background-image: 
    radial-gradient(white $dotSize, transparent 0),
    radial-gradient(white $dotSize, transparent 0);
  background-size: $size $size;
  background-position: 0 0, ($size / 2) ($size / 2);
}

.argyle {
  $deepColor: rgba(0, 0, 0, .1);
  $stripColor: rgba(255, 255, 255, .1);
  $argyleSize: 60px;
  background-color: grey;
  background-image:
    repeating-linear-gradient(120deg, 
      $stripColor, 
      $stripColor 1px, 
      transparent 1px, 
      transparent ($argyleSize / 2)
    ),
    repeating-linear-gradient(60deg, 
      $stripColor, 
      $stripColor 1px, 
      transparent 1px, 
      transparent ($argyleSize / 2)
    ),
    linear-gradient(60deg, 
      $deepColor 25%, 
      transparent 25%, 
      transparent 75%, 
      $deepColor 75%, 
      $deepColor
    ),
    linear-gradient(120deg, 
      $deepColor 25%, 
      transparent 25%, 
      transparent 75%, 
      $deepColor 75%, 
      $deepColor
    );
  background-size: ($argyleSize / sqrt(3)) $argyleSize;
}

.checkerboard {
  $deepColor: rgba(0, 0, 0, .2);
  $cubeSize: 25px;
  background-color: grey;
  background-image: 
    linear-gradient(45deg, 
      $deepColor 25%, 
      transparent 25%, 
      transparent 75%, 
      $deepColor 75%, 
      $deepColor
    ), 
    linear-gradient(45deg, 
      $deepColor 25%, 
      transparent 25%, 
      transparent 75%, 
      $deepColor 75%, 
      $deepColor
    );
  background-size: ($cubeSize * 2) ($cubeSize * 2);
  background-position: 0 0, $cubeSize $cubeSize;
}

.tartan {
  $length: 30px;
  $middleLength: 5px;
  $shortLength: 2px;
  $deepColor: rgba(0, 0, 0, .4);
  $lightColor: rgba(255, 255, 255, .2);
  $stripColor: rgba(0, 0, 0, .2);
  background-color: grey;
  background-image: 
    repeating-linear-gradient(
      transparent, 
      transparent $length, 
      $deepColor $length, 
      $deepColor ($length + $shortLength), 
      transparent ($length + $shortLength), 
      transparent ($length + $middleLength + $shortLength), 
      $deepColor ($length + $middleLength + $shortLength), 
      $deepColor ($length + $middleLength + $shortLength * 2), 
      transparent ($length + $middleLength + $shortLength * 2), 
      transparent ($length * 2 + $middleLength + $shortLength * 2), 
      $deepColor ($length * 2 + $middleLength + $shortLength * 2), 
      $deepColor ($length * 3 + $middleLength + $shortLength * 2), 
      $lightColor ($length * 3 + $middleLength + $shortLength * 2), 
      $lightColor ($length * 3 + $middleLength + $shortLength * 3), 
      $deepColor ($length * 3 + $middleLength + $shortLength * 3), 
      $deepColor ($length * 3 + $middleLength * 2 + $shortLength * 3), 
      $lightColor ($length * 3 + $middleLength * 2 + $shortLength * 3), 
      $lightColor ($length * 3 + $middleLength * 2 + $shortLength * 4), 
      $deepColor ($length * 3 + $middleLength * 2 + $shortLength * 4), 
      $deepColor ($length * 4 + $middleLength * 2 + $shortLength * 4), 
      transparent ($length * 4 + $middleLength * 2 + $shortLength * 4)
    ),
    repeating-linear-gradient(270deg, 
      transparent, 
      transparent $length, 
      $deepColor $length, 
      $deepColor ($length + $shortLength), 
      transparent ($length + $shortLength), 
      transparent ($length + $middleLength + $shortLength), 
      $deepColor ($length + $middleLength + $shortLength), 
      $deepColor ($length + $middleLength + $shortLength * 2), 
      transparent ($length + $middleLength + $shortLength * 2), 
      transparent ($length * 2 + $middleLength + $shortLength * 2), 
      $deepColor ($length * 2 + $middleLength + $shortLength * 2), 
      $deepColor ($length * 3 + $middleLength + $shortLength * 2), 
      $lightColor ($length * 3 + $middleLength + $shortLength * 2), 
      $lightColor ($length * 3 + $middleLength + $shortLength * 3), 
      $deepColor ($length * 3 + $middleLength + $shortLength * 3), 
      $deepColor ($length * 3 + $middleLength * 2 + $shortLength * 3), 
      $lightColor ($length * 3 + $middleLength * 2 + $shortLength * 3), 
      $lightColor ($length * 3 + $middleLength * 2 + $shortLength * 4), 
      $deepColor ($length * 3 + $middleLength * 2 + $shortLength * 4), 
      $deepColor ($length * 4 + $middleLength * 2 + $shortLength * 4), 
      transparent ($length * 4 + $middleLength * 2 + $shortLength * 4)
    ),
    repeating-linear-gradient(125deg, 
      transparent, 
      transparent 2px, 
      $stripColor 2px, 
      $stripColor 3px, 
      transparent 3px, 
      transparent 5px, 
      $stripColor 5px
    );
}

.net {
  $size: 40px;
  $holeSize: 40%;
  $reflective: hsla(0, 0%, 100%, .1);
  background:
    radial-gradient(black $holeSize, transparent 0) 0 0,
    radial-gradient(black $holeSize, transparent 0) ($size / 2) ($size / 2),
    radial-gradient($reflective $holeSize, transparent 20%) 0 1px,
    radial-gradient($reflective $holeSize, transparent 20%) ($size / 2) ($size / 2 + 1px);
  background-color: #282828;
  background-size: $size $size;
  background-clip: content-box;
}

.seigaiha {
  $mizuColor: grey;
  $size: 40px;
  background-color: $mizuColor;
  background-image: 
    radial-gradient(
      circle at 100% 150%, 
      $mizuColor 25%, 
      white 25%, 
      white 29%, 
      $mizuColor 29%, 
      $mizuColor 36%, 
      white 36%, 
      white 40%, 
      transparent 40%, 
      transparent
    ),
    radial-gradient(
      circle at 0 150%, 
      $mizuColor 25%, 
      white 25%, 
      white 29%, 
      $mizuColor 29%, 
      $mizuColor 36%, 
      white 36%, 
      white 40%, 
      transparent 40%, 
      transparent
    ),
    radial-gradient(
      circle at 50%  100%, 
      white 10%, 
      $mizuColor 10%, 
      $mizuColor 23%, 
      white 23%, 
      white 30%, 
      $mizuColor 30%, 
      $mizuColor 43%, 
      white 43%, 
      white 50%, 
      $mizuColor 50%, 
      $mizuColor 63%, 
      white 63%, 
      white 70%, 
      transparent 70%, 
      transparent
    ),
    radial-gradient(
      circle at 100% 50%, 
      white 5%, 
      $mizuColor 5%, 
      $mizuColor 15%, 
      white 15%, 
      white 20%, 
      $mizuColor 20%, 
      $mizuColor 30%, 
      white 30%, 
      white 35%, 
      $mizuColor 35%, 
      $mizuColor 45%, 
      white 45%, 
      white 50%, 
      transparent 50%, 
      transparent
    ),
    radial-gradient(
      circle at 0 50%, 
      white 5%, 
      $mizuColor 5%, 
      $mizuColor 15%, 
      white 15%, 
      white 20%, 
      $mizuColor 20%, 
      $mizuColor 30%, 
      white 30%, 
      white 35%, 
      $mizuColor 35%, 
      $mizuColor 45%, 
      white 45%, 
      white 50%, 
      transparent 50%, 
      transparent
    );
  background-size: $size ($size / 2);
}

.houndstooth {
  $size: 1.5em;
  background:
    linear-gradient(-45deg, 
      white 25%, 
      transparent 25%, 
      transparent 75%, 
      black 75%, 
      black
    ) 0 0,
    linear-gradient(-45deg, 
      black 25%, 
      transparent 25%, 
      transparent 75%, 
      white 75%, 
      white
    ) ($size / 2) ($size / 2),
    linear-gradient(45deg, 
      black 17%, 
      transparent 17%, 
      transparent 25%, 
      black 25%, 
      black 36%, 
      transparent 36%, 
      transparent 64%, 
      black 64%, 
      black 75%, 
      transparent 75%, 
      transparent 83%, 
      black 83%
    ) ($size / 2) ($size / 2);
  background-color: white;
  background-size: $size $size;
  background-clip: content-box;
}

.flower {
  $ikkonzomeColor: #333;
  $wasurenagusaColor: grey;
  background:
    radial-gradient(circle at 20px 20px,
      $ikkonzomeColor 4px,
      #ddd 4px,
      #ddd 7px,
      transparent 0
    ) 5px 5px,
    radial-gradient(circle at 20px 13px,
      $ikkonzomeColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    )  5px 5px,
    radial-gradient(circle at 12px 20px,
      $ikkonzomeColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    ) 5px 5px,
    radial-gradient(circle at 27px 20px,
      $ikkonzomeColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    )  5px 5px,
    radial-gradient(circle at 20px 25px,
      $ikkonzomeColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    )  5px 5px,
    radial-gradient(circle at 20px 20px,
      $wasurenagusaColor 4px,
      #ddd 4px,
      #ddd 7px,
      transparent 0
    )  40px 40px,
    radial-gradient(circle at 20px 13px,
      $wasurenagusaColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    ) 40px 40px,
    radial-gradient(circle at 12px 20px,
      $wasurenagusaColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    ) 40px 40px,
    radial-gradient(circle at 27px 20px,
      $wasurenagusaColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    ) 40px 40px,
    radial-gradient(circle at 20px 25px,
      $wasurenagusaColor 10px,
      #ddd 10px,
      #ddd 13px,
      transparent 0
    ) 40px 40px;
  background-color: #ddd; 
  background-size: 70px 70px;
  background-clip: content-box;
}

.wave {
  background-image: 
    repeating-radial-gradient(
      circle at 0 0, 
      transparent 0,
      #eee 10px
    ),
    repeating-linear-gradient(
      #ccc,
      #777
    );
}

.carbon {
  background:
    linear-gradient(27deg, 
      #151515 5px, 
      transparent 5px
    ) 0 5px,
    linear-gradient(207deg, 
      #151515 5px, 
      transparent 5px
    ) 10px 0px,
    linear-gradient(27deg, 
      #222 5px, 
      transparent 5px
    ) 0px 10px,
    linear-gradient(207deg, 
      #222 5px, 
      transparent 5px
    ) 10px 5px,
    linear-gradient(90deg, 
      #1b1b1b 10px, 
      transparent 10px
    ),
    linear-gradient(
      #1d1d1d 25%, 
      #1a1a1a 25%, 
      #1a1a1a 50%, 
      transparent 50%, 
      transparent 75%, 
      #242424 75%, 
      #242424
    );
  background-color: #131313;
  background-size: 20px 20px;
  background-clip: content-box;
}
!

JS
!
999px

Console