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HTML

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About the <head>

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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-.

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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.

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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.

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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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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.

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HTML 

              
                %h1 Custom CSS Scrollbar

.demo
	%h2 Default
	.scrollbar
		.fake-content
		
.demo
	%h2 Dark
	.scrollbar.scrollbar--dark
		.fake-content
		
.demo
	%h2 Light
	.scrollbar.scrollbar--light
		.fake-content
		
.demo
	%h2 Light Reversed
	.scrollbar.scrollbar--light-reversed
		.fake-content
		
.demo
	%h2 Seafoam
	.scrollbar.scrollbar--seafoam
		.fake-content

.demo
	%h2 Extreme
	.scrollbar.scrollbar--extreme
		.fake-content
!

CSS 

              
                $blue: #3498db
$green: #1abc9c
$red: #c0392b
$stone: #bdc3c7
$slate: darken($stone, 50)
$yellow: #f1c40f

html
	overflow-y: scroll
	padding: 5%
	background: $stone

img
	max-width: 100%
	vertical-align: bottom

h2
	font-size: 1.1rem

// Demo
// ----

.demo
	float: left
	height: 400px
	margin: 0 1em 0 0
	padding: 0 0 3em
	width: 170px

.scrollbar
	background: #fff
	height: 100%
	overflow: auto
	-webkit-overflow-scrolling: touch
	
.fake-content
	height: 200%
	width: 400%
	$line-color: rgba(#000, .1)
	$line-size: 1px
	$space-between: 50px
	background-image: linear-gradient(to right, $line-color $line-size, transparent $line-size), linear-gradient(to bottom, $line-color $line-size, transparent $line-size)
	background-size: $space-between $space-between


// Sass mixin that customizes the browser scrollbar
//
// $thumb-color - moving part of the scrollbar
// $track-color - background of the scrollbar
// $variation - 'lighten' or 'darken'
// $size - horizontal width and vertical height of the scrollbar
=scrollbars($thumb-color: #606060, $track-color: #393939, $variation: 'lighten', $size: 10px)
	// Firefox:
	// https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Scrollbars
	scrollbar-color: $thumb-color $track-color

	@if $size < 15px
		scrollbar-width: thin

	// Webkit:
	// https://developer.mozilla.org/en-US/docs/Web/CSS/::-webkit-scrollbar

	&::-webkit-scrollbar
		height: $size
		width: $size
		background-color: red

	&::-webkit-scrollbar-corner
		background: $track-color

	&::-webkit-scrollbar-thumb
		background: $thumb-color
		border: 1px solid $track-color

		&:hover
			@if $variation == 'lighten'
				background: lighten($thumb-color, 15)
			@if $variation == 'darken'
				background: desaturate(darken($thumb-color, 40), 20)
	
		// &:active
		// 	@if $variation == 'lighten'
		// 		background: lighten($thumb-color, 30)
		// 	@if $variation == 'darken'
		// 		background: desaturate(darken($thumb-color, 50), 20)

	&::-webkit-scrollbar-track
		border: 1px solid $track-color
		background-color: $track-color

//
// Variations

.scrollbar--dark
	+scrollbars
	background: rgba(#1c1c1c, .7)

.scrollbar--light
	+scrollbars(#eaeaea, #d4d4d4, 'darken')

.scrollbar--light-reversed
	+scrollbars(#d4d4d4, #eaeaea, 'darken')
	
.scrollbar--seafoam
	+scrollbars(#def1ee, #bcd7d2, 'darken')
	
.scrollbar--extreme
	+scrollbars(gold, crimson, 'lighten', 40px)
!

JS
!
999px

Console