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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.

     

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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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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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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.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              .content
	canvas.snow#snow
	.main-text
		h1 Aw jeez.
			br
			| That page has gone missing.
		a.home-link(href='#') Hitch a ride back home.
	.ground
		.mound 
			.mound_text 404
			.mound_spade
!

CSS

            
              $col-sky-top: #bbcfe1;
$col-sky-bottom: #e8f2f6;
$col-fg: #5d7399;
$col-blood: #dd4040;
$col-ground: #f6f9fa;

@mixin trees($direction, $size) {
	$shadow: ();
	
	@for $i from 1 through 16 {
		$space: $size * 1.2;
		$rand:  (random(20)/10 - 1) * 50px;
		$shadow: append($shadow, ($direction * $i * $space + $rand) (($direction * -$i * $space) + $rand) 15px lighten($col-fg, random(20) + 10%), comma);
	}
		
	box-shadow: $shadow;
}

html,
body {
	height: 100%;
	min-height: 450px;
	
	font-family: 'Dosis', sans-serif;
	font-size: 32px;
	font-weight: 500;
	color: $col-fg;
}

.content {
	height: 100%;
	position: relative;
	
	z-index: 1;
	background-color: mix($col-sky-top, $col-sky-bottom);
	background-image: linear-gradient(to bottom, $col-sky-top 0%, $col-sky-bottom 80%);
	overflow: hidden;
}

.snow {
	position: absolute;
	top: 0;
	left: 0;
	pointer-events: none;
	z-index: 20;
}

.main-text {
	padding: 20vh 20px 0 20px;
	
	text-align: center;
	line-height: 2em;
	font-size: 5vh;
}

.home-link {
	font-size: 0.6em;
	font-weight: 400;
	color: inherit;
	text-decoration: none;
	
	opacity: 0.6;
	border-bottom: 1px dashed transparentize($col-fg, 0.5);
	
	&:hover {
		opacity: 1;
	}
}

.ground {
	height: 160px;
	width: 100%;
	position: absolute;
	bottom: 0;
	left: 0;
	
	background: $col-ground;
	box-shadow: 0 0 10px 10px $col-ground;
	
	$treeSize: 250px;
	&:before,
	&:after {
		
		// Trees
		content: '';
		display: block;
		width: $treeSize;
		height: $treeSize;
		position: absolute;
		top: -$treeSize/4;
		
		z-index: -1;
		background: transparent;
		transform: scaleX(0.2) rotate(45deg);
	}
	
	&:after {
		left: 50%;
		margin-left: -$treeSize / 1.5;
		@include trees(-1, $treeSize);
	}
	
	&:before {
		right: 50%;
		margin-right: -$treeSize / 1.5;
		@include trees(1, $treeSize);
	}
}

.mound {
	margin-top: -80px;
	
	font-weight: 800;
	font-size: 180px;
	text-align: center;
	color: $col-blood;
	pointer-events: none;
	
	$from-top: 50px;
	
	&:before {
		$w: 600px;
		$h: 200px;
		
		content: '';
		display: block;
		width: $w;
		height: $h;
		position: absolute;
		left: 50%;
		margin-left: -$w/2;
		top: $from-top;
		z-index: 1;
		
		border-radius: 100%;
		background-color: $col-sky-bottom;
		background-image: linear-gradient(to bottom, lighten($col-sky-top, 10%), $col-ground 60px);
	}
	
	&:after {
		// Blood
		$w: 28px;
		$h: 6px;
		content: '';
		display: block;
		width: $w;
		height: $h;
		position: absolute;
		left: 50%;
		margin-left: - 150px;
		top: $from-top + 18px;
		
		z-index: 2;
		background: $col-blood;
		border-radius: 100%;
		transform: rotate(-15deg);
		box-shadow: -($w * 2) ($h * 2) 0 1px $col-blood, -($w * 4.5) ($h) 0 2px $col-blood, -($w * 7) ($h * 4) 0 3px $col-blood,
	}
}

.mound_text {
	transform: rotate(6deg);
}

.mound_spade {
	$handle-height: 30px;
	
	display: block;
	width: 35px;
	height: 30px;
	position: absolute;
	right: 50%;
	top: 42%;
	margin-right: -250px;
	
	z-index: 0;
	transform: rotate(35deg);
	background: $col-blood;
	
	&:before,
	&:after {
		content: '';
		display: block;
		position: absolute;
	}
	
	&:before {
		width: 40%;
		height: $handle-height;
		bottom: 98%;
		left: 50%;
		margin-left: -20%;
		
		background: $col-blood;
	}
	
	&:after {
		width: 100%;
		height: 30px;
		top: -$handle-height - 25px;
		left: 0%;
		box-sizing: border-box;
		
		border: 10px solid $col-blood;
		border-radius: 4px 4px 20px 20px;
	}
}
!

JS

            
              (function() {
	function ready(fn) {
		if (document.readyState != 'loading'){
			fn();
		} else {
			document.addEventListener('DOMContentLoaded', fn);
		}
	}
	
	function makeSnow(el) {
		var ctx = el.getContext('2d');
		var width = 0;
		var height = 0;
		var particles = [];
		
		var Particle = function() {
			this.x = this.y = this.dx = this.dy = 0;
			this.reset();
		}
		
		Particle.prototype.reset = function() {
			this.y = Math.random() * height;
			this.x = Math.random() * width;
			this.dx = (Math.random() * 1) - 0.5;
			this.dy = (Math.random() * 0.5) + 0.5;
		}
		
		function createParticles(count) {
			if (count != particles.length) {
				particles = [];
				for (var i = 0; i < count; i++) {
					particles.push(new Particle());
				}
			}
		}
				
		function onResize() {
			width = window.innerWidth;
			height = window.innerHeight;
			el.width = width;
			el.height = height;
			
			createParticles((width * height) / 10000);
		}
		
		function updateParticles() {
			ctx.clearRect(0, 0, width, height);
			ctx.fillStyle = '#f6f9fa';
			
			particles.forEach(function(particle) {
				particle.y += particle.dy;
				particle.x += particle.dx;
				
				if (particle.y > height) {
					particle.y = 0;
				}
				
				if (particle.x > width) {
					particle.reset();
					particle.y = 0;
				}
				
				ctx.beginPath();
				ctx.arc(particle.x, particle.y, 5, 0, Math.PI * 2, false);
				ctx.fill();
			});
			
			window.requestAnimationFrame(updateParticles);
		}
		
		onResize();
		updateParticles();
		
		window.addEventListener('resize', onResize);
	}
	
	ready(function() {
		var canvas = document.getElementById('snow');
		makeSnow(canvas);
	});
})();
!
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