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HTML

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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>

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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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HTML 

              
                <figure>
	<h1>is<br />it</h1>
	<h2><span data-letter="k">k</span><span data-letter="i">i</span><span data-letter="n">n</span><span data-letter="d">d</span></h2>
	<h2><span data-letter="t">t</span><span data-letter="r">r</span><span data-letter="u">u</span><span data-letter="e">e</span></h2>	
	<h2><span data-letter="n">n</span><span data-letter="e">e</span><span data-letter="c">c</span><span data-letter="e">e</span><span data-letter="s">s</span><span data-letter="s">s</span><span data-letter="a">a</span><span data-letter="r">r</span><span data-letter="y">y</span></h2>	
	<h3>??<br />??</h3>
</figure>
<script id="effect_vertexShader" type="x-shader/x-vertex">
  varying vec2 vUv;
  void main() {
    vUv = uv;gl_Position = projectionMatrix * modelViewMatrix * vec4(position,1);
  }
</script>
<script id="effect_fragmentShader" type="x-shader/x-fragment">
varying vec2 vUv;
uniform vec2 resolution;
uniform float time;
float usin(float value) {
	return sin(value * 2.45873)*0.05 + 0.05;
}
float noise(vec2 pos, float time) {
	pos.x += usin(pos.y * 2.1 + 0.01) ;
	pos.y += usin(.01);
	float valueX = 0.0;
	valueX += usin(pos.x + time * .6 + usin(pos.y * 0.5 + 0.1) * .5);
	valueX += usin(pos.y + 10.10 + usin(pos.y * 2.5 + time * 0.1) * usin(pos.x * 0.05)* .05) ;
	valueX /= .025;
	float valueY = 0.0;
	valueY += usin(pos.x + usin(pos.x * .5+ 0.2)*.05);
	valueY += usin(pos.y * 0.1 + usin(pos.x * 1.1  + time * 0.1) * usin(pos.y * .05)* 0.05);
	valueY /= .5;
	float value = valueX * valueY;
	return value;
}
void main(){
	vec2 sourceCoord = vUv - 122.5;
	sourceCoord.x *= resolution.x / resolution.y;
	vec4 outputColour = vec4(0.0, 0.0, 0.0, 1.0);
	float noise1 = noise(sourceCoord, time);
	float noise2 = noise(sourceCoord * 0.5 + noise1 + 2.232, time);
	float noise3 = noise(sourceCoord * 0.1 + vec2(noise1, noise2) + 21.232, time);
	float noiseVal = (noise1 + noise2 + noise3)/1.0;
	for (int i = 1; i < 20; i++) {
		noiseVal = usin(noiseVal+time*.5);
	}
	noiseVal = noise(sourceCoord * 1.10 + noiseVal + .62, time);
	outputColour.rgb = vec3(noiseVal*1.0);
	outputColour.b = cos(noiseVal*6.100);
	outputColour.g = cos(noiseVal*2.100);
	outputColour.r = cos(noiseVal*3.100);
	gl_FragColor = outputColour;
}
</script>
!

CSS 

              
                @mixin fluid-type($min-font-size: 12px, $max-font-size: 18px, $lower-range: 420px, $upper-range: 900px) {
	font-size: calc(#{$min-font-size} + #{(($max-font-size / ($max-font-size * 0 + 1)) - ($min-font-size / ($min-font-size * 0 + 1)))} * ( (100vw - #{$lower-range}) / #{(($upper-range / ($upper-range * 0 + 1)) - ($lower-range / ($lower-range * 0 + 1)))}));
	@media screen and (max-width: $lower-range) {
		font-size: $min-font-size;
	}
	@media screen and (min-width: $upper-range){
		font-size: $max-font-size;
	}
}
@font-face {
  font-family: 'Cardinal';
  src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/cardinalfruit-medium-TRIAL.eot');
  src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/cardinalfruit-medium-TRIAL.eot?#iefix') format('embedded-opentype'),
       url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/cardinalfruitw-medium-TRIAL.woff') format('woff');
  font-style:   normal;
  font-weight:  400;
}
@font-face {
  font-family: 'Sporting Grotesque';
  src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/Sporting_Grotesque-Bold.eot');
  src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/Sporting_Grotesque-Bold.eot?#iefix') format('embedded-opentype'),
       url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/Sporting_Grotesque-Bold.woff') format('woff'),
       url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/253981/Sporting_Grotesque-Bold.ttf')  format('truetype');
  font-style:   normal;
  font-weight:  400;
}
html{
	-webkit-font-smoothing: antialiased !important;
	text-shadow: 1px 1px 1px rgba(0,0,0,0.004);
	transition: background-color 2s ease;
	@include fluid-type(6px, 40px, 320px, 2400px);
}
figure{
	position:absolute;
	width:40vw;
	max-width:420px;
	height:57vw;
	max-height:599px;
	top:50%;
	left:50%;
	text-align: center;
	color: white;
	overflow:hidden;
	box-shadow: 0px 0px 10px rgba(0,0,0,0.2);
	transform: translate3d(-50%, -50%, 0);
	perspective: 800px;
	background: rgba(255,255,255,1);
	&:after{
		content:'';
		position:absolute;
		top:0;
		left:0;
		width:100%;
		height:100%;
		z-index:10;
		transition: background-color 2s ease;
		opacity:1;
		mix-blend-mode:exclusion;
	}
	canvas{
		opacity:0.9;
		z-index:1;
	}
	h1, h3{
		position: absolute;
		left:50%;
		z-index:100;
		color: white;
		z-index:100;
		font-family:'Sporting Grotesque', sans-serif;
		text-transform: uppercase;
		font-size: 50%;
		line-height:1.5;
		letter-spacing: 0.2rem;
		&:after{
			//content:'';
			position:absolute;
			height:4vw;
			width:4vw;
			top:50%;
			left:50%;
			opacity:0.6;
			transform:translateY(-50%) translateX(-50%) rotate(45deg);
			border:1px solid white;
			border-radius:10px;
		}
	}
	h1{top:calc(30%);transform:translateX(-50%) translateY(-100%);}
	h3{bottom: calc(30%);transform:translateX(-50%) translateY(100%);}
	h2{
		position: absolute;
		top:50%;
		left:50%;
		z-index:100;
		font-size:250%;
		line-height:0;
		font-family:'Cardinal', serif;
		text-transform:uppercase;
		white-space: nowrap;
		backface-visibility:hidden;
		transform: translate3d(-50%, -50%, 0) scaleY(0.5);
		transform-origin: 50% 50%;
		transition: transform 0s ease 1s;
		span{
			position: relative;
			display:inline-block;
			color:transparent;
			&:after{
				top:50%;
				left:50%;
				content:attr(data-letter);
				position:absolute;
				color: white;
				transform: translate3d(-50%, -50%, 0) rotate3d(1,0,0,90deg);
				transform-origin: 50% 0%;
				transition: transform .2s, opacity .2s;
			}
			@for $i from 20 through 1 {
				&:nth-of-type(#{$i}){
					&:after{
						transition: color .5s ease, transform .2s ease 0.1s * $i, opacity .2s ease 0s * $i;
					}
				}
			}	
			
		}	
		&:nth-of-type(3){
			span{
				@for $i from 20 through 1 {
					&:nth-of-type(#{$i}){
						&:after{
							transition: color .5s ease, transform .2s ease 0.05s * $i, opacity .2s ease 0s * $i;
						}
					}
				}					
			}
		}
	}
}
.first{
	background-color:#fce8e5;
		figure:after{
		background-color:#f99689;
	}
	figure h2:nth-of-type(1){
		transform: translate3d(-50%, -50%, 0) scaleY(2.5);
		transition: transform 4s ease;
		transform-origin: 50% 50%;
		span{	
			@for $i from 1 through 20 {
				&:nth-of-type(#{$i}){
					&:after{
						transform: translate3d(-50%, -50%, 0) rotate3d(0,1,0,0deg);
						transition: color .5s ease, transform .5s ease .2s * $i, opacity .5s ease .2s * $i;
					}
				}
			}
		}
	}
}
.second{
	background-color:#eafcf8;	
	figure:after{
		background-color:#89f9e0;
	}
	figure h2{
		&:nth-of-type(2){
			transform: translate3d(-50%, -50%, 0) scaleY(2.5);
			transition: transform 4s ease;
			transform-origin: 50% 50%;
			span{
				@for $i from 1 through 20 {
					&:nth-of-type(#{$i}){
						&:after{
							transform: translate3d(-50%, -50%, 0) rotate3d(0,1,0,0deg);
							transition: color .5s ease, transform .5s ease .2s * $i, opacity .5s ease .2s * $i;
						}
					}
				}
			}
		}
	}
}	
.third{
	background-color:#fff8ed;
	figure:after{
		background-color:#ffc054;
	}
	figure h2{
		&:nth-of-type(3){
		transform: translate3d(-50%, -50%, 0) scaleY(2.5);
		transition: transform 4s ease;	
			span{
			 	@for $i from 1 through 20 {
					&:nth-of-type(#{$i}){
						&:after{
							transform: translate3d(-50%, -50%, 0) rotate3d(0,1,0,0deg);
							transition: color .5s ease, transform .5s ease .08s * $i, opacity .5s ease .1s * $i;
						}
					}
				}
			}
		}
	}
}
!

JS 

              
                c = 1;
setInterval(function(){
	c++;
	
	if(c === 1){
		$('html').attr('class','first');	
	}
	if(c === 2){
		$('html').attr('class','second');	
	}
	if(c === 3){
		$('html').attr('class','third');
		c = 0;
	}	
}, 3500);
var bgColor = 0x000000;
var bgAlpha = 0;
var renderer = null;
var clock = null;
var effectScene = null;
var effectCamera = null;
var effectShader = null;
var effectShaderMaterial = null;
var effectSurfaceMesh = null;
var time = 0;
var tMY = 0;
var tMX = 0;
renderer = new THREE.WebGLRenderer({antialias: false, alpha: true});
renderer.setSize($('figure').width(), $('figure').height());
renderer.setClearColor(bgColor, bgAlpha);
$('figure').append(renderer.domElement);
clock = new THREE.Clock();
effectScene = new THREE.Scene();
effectCamera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
effectShader = {
	uniforms: {
		"time":   { type: "f", value: 0 },
		"mouse": {type: "2f", value: [0, 0]},
		"viewSize":   { type: "2f", value: [1024, 768] },
		"image1Size":   { type: "2f", value: [1024, 768]},
		"resolution": {type: "2f", value: [$('figure').width(), $('figure').height()]}
	},
	vertexShader: document.getElementById('effect_vertexShader').textContent,
	fragmentShader: document.getElementById('effect_fragmentShader').textContent
};
effectShaderMaterial = new THREE.ShaderMaterial(effectShader);
effectSurfaceMesh = new THREE.Mesh(new THREE.PlaneBufferGeometry( 2, 2 ), effectShaderMaterial);
effectScene.add(effectSurfaceMesh);  
window.onresize = updateViewportSize;
updateViewportSize();
render();
function updateViewportSize() {
  renderer.setSize($('figure').width(), $('figure').height());
  effectShaderMaterial.uniforms['viewSize'].value = [$('figure').width(), $('figure').height()];
  effectCamera.aspect = $('figure').width(), $('figure').height();
  effectCamera.updateProjectionMatrix();
};
function render(name) {
	time = clock.getElapsedTime();
	tMX += tMX*0.01;
	tMY += tMY*0.01;  
	renderer.render(effectScene, effectCamera);
	effectShaderMaterial.uniforms['time'].value = time;
	requestAnimationFrame(render);
};
!
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