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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.

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CSS

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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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JavaScript

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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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HTML 

              
                <svg height="0" width="0" style="display: block; pointer-events: none;">
	<g id="logo_technology">
		<path d="M14.1,27.6L25,31.9l10.7-4.2c0,0,0.1-0.1,0.1-0.1c0.7-1.2,1.1-2.5,1.1-4.1c0.1-1.5-0.2-4.1-0.9-7.7L33.3,0
			l-6.1,1.1l2.9,16.6c0.4,2.4,0.6,4.1,0.6,5.1c0,1.1-0.4,2-1.1,2.9c-0.7,0.9-2,1.4-3.7,1.7c-0.6,0.1-1.1,0.2-1.6,0.2
			c-1,0-1.8-0.2-2.6-0.6c-1.1-0.6-1.9-1.4-2.4-2.6c-0.3-0.7-0.7-2.4-1.1-5L15.4,3.2L9.4,4.2l2.8,16C12.8,23.5,13.4,26,14.1,27.6z"/>
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			c0.6-0.7,1-1.5,0.9-2.4c0-0.9-0.2-2.4-0.5-4.5L25,22.9l-6.5-6.5l0.5,2.9C19.4,21.8,19.8,23.4,20.1,24.1z"/>
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			l-11.8-4.6c-0.6-1.7-1.2-4-1.7-6.9L11,17.5l-6.1,1.3v0.7l6.5,7.1l-11-4.3L0,22.9l11.9,5.9l0,0L22.2,33L12,29.6l0.5,9.3L25,45.8
			l12.5-6.9l0.6-10l11.9-6L49.6,22.2z M25.3,34.2L25,43.1l-0.3-9.3l10.8-3.5L25.3,34.2z"/>
	
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		<path d="M154,44.9v-0.6l2.2,0v1.9c-0.3,0.3-0.7,0.5-1.1,0.6c-0.4,0.1-0.7,0.2-1.1,0.2c-0.5,0-1-0.1-1.4-0.3
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			c0.3-0.1,0.5-0.2,0.7-0.4v-1H154z"/>
		<path d="M159.3,46.9v-2.2l-2-3h0.8l1,1.6c0.2,0.3,0.4,0.6,0.5,0.9c0.2-0.3,0.3-0.6,0.6-0.9l1-1.5h0.8l-2.1,3v2.2
			H159.3z"/>
	</g>
</svg>
<main>
	<div class="label">
		<h1>Unboxed Technology Footer Animation</h1>
		<small>Click the Bouncing box</small>
		<a href="#" class="button js-trigger-reset">
			<span>Reset</span>
		</a>
	</div>
	<div class="-content -index">
		<div>
			
			
			<div class="bounce-wrap">
				<div class="bounce">
					<div class="-shadow"></div>
					<div class="-box-wrap js-box-wrap">
						<div class="-box">
							<div class="front wall"></div>
							<div class="back wall"></div>
							<div class="right wall"></div>
							<div class="left wall"></div>

							<div class="front-right wall"></div>
							<div class="front-left wall"></div>
							<div class="back-right wall"></div>
							<div class="back-left wall"></div>  
						</div>
					</div>
					<div id="emitter"></div>
					<div class="explode">
						<span class="cloud -one js-cloud-1"></span>
						<span class="cloud -two js-cloud-2"></span>
						<span class="cloud -three js-cloud-3"></span>
					</div>
					<svg class="icon js-icon-logo" viewBox="0 0 162.5 47">
						<use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#logo_technology"></use>
					</svg>
				</div>
			</div>
			
			
    	</div>
	</div>
</main>
!

CSS 

              
                $ship_cove: #6f7dbc;
$tree_poppy: #f8981c;
$white: #ffffff;
$cube-size: 32px;
$lightb: #d1d5e9;
$darkb: #96a0ce;
$leftb: #b0c2d6;
$rightb: #8a9fb4;
$top: #f8f8fc;
$greyline: #000;

@keyframes bounce {
  0% {
    transform: translateY( 0 );
  }
  100% {
    transform: translateY( -25px );
  }
}

@keyframes shadow {
  0% {
    background: rgba(0,0,0, 0.5);
    transform: scale( 0.75 ) rotateX(75deg) rotateY(0deg) rotateZ(-45deg);
    box-shadow: 0 0 0px rgba(0,0,0, 0.6);
  }
  100% {
    background: rgba(0,0,0, 0.15);
    transform: scale( 1 ) rotateX(75deg) rotateY(0deg) rotateZ(-45deg);
    box-shadow: 0 0 10px rgba(0,0,0, 0.3);
  }
}

body{
	font-size: 1.6rem;
	font-family: "Open Sans", sans-serif;
	color: #fff;
	background-color: #36373c;
	-webkit-font-smoothing: antialiased;
	margin: 0;
	padding: 0;
	overflow: hidden;
}
.label{
	width: 100%;
	position: absolute;
	text-align: center;
	small{
		display: block;
		margin-bottom: 1em;
	}
}
h1{
  color: #fff;
	margin: 1em 0 0;
  /* margin-bottom: 1em; */
  font-size: 2.2rem;
  font-weight: 100;
}
main {
  height: 100vh;
  /* padding: 10px; */
  text-align: center;
  
  .-content{
    position: relative;
    height: 100vh;
    
    > div {
      height: 100%;
      overflow: hidden;
      overflow-y: auto;
    }
    
    &.-index{
        display: table;
        width: 100%;
      
      > div {
        display: table-cell;
        vertical-align: middle;
      }
    }
  }
}

.button{
	cursor: pointer;
	text-align: center;
	border: 0;	
	text-decoration: none;
	position: relative;
	display: none;
	z-index: 10;
	padding: 1rem 3rem;
	line-height: 1rem;


	span{
		font-size: 1rem;
		vertical-align: middle;
		text-transform: uppercase;
		font-weight: 800;
		color: $white;
		display: block;
	}

	&:hover{
		&:before{
			opacity: 1;
			transform: scale(1);
		}
		&:after{
			opacity: 0;
			transform: scale(0.85);
		}
	}

	&:before,
	&:after{
		display: block;
		content: ' ';
		z-index: -1;
		border-radius: 999px;
		pointer-events: none;
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;
		height: 100%;
		backface-visibility: hidden;
		transition: all 280ms;
		animation-timing-function: cubic-bezier(0.75, 0, 0.125, 1);
	}

	&:after{
		background-color: $tree_poppy;
	}
	&:before{
		opacity: 0;
		transform: scale(1.15);
		background-color: $ship_cove;
	}
}

#emitter{
	width: 50px;
	height: 60px;
	// background-color: lighten($tuna, 10%);
	display: block;
	position: absolute;
	left: 50%;
	transform: translateX(-50%) translateY(-12px);
	cursor: pointer;

}
.emitter-dot {
	background-color: #fff;
	border-radius: 999px;
	position: absolute;
}
// bouncy box
.bounce-wrap{
	display: block;
	height: 90px;

	.icon{
		width: 232px;
		height: 66px;
		position: absolute;
		fill: $white;
		left: 47%;
		transform: translateX(-50%) translateY(-32px);
		opacity: 0;
		visibility: hidden;
	}
}
.bounce{
	position: relative;
	margin: 4rem 0;

	.-box,
	.-box-wrap,
	.-shadow{
		left: 0;
		margin: auto;
		position: absolute;
		right: 0;
		top: 0;
	}
	.-shadow{

		bottom: -90px;
		height: 32px;
		width: 32px;
		background: rgba(0,0,0, 0.5);
	    transform: scale( 0.75 ) rotateX(75deg) rotateY(0deg) rotateZ(-45deg);
	    box-shadow: 0 0 0px rgba(0,0,0, 0.6);
		animation: shadow 250ms cubic-bezier(0.165, 0.840, 0.440, 1.000) infinite alternate;
	}
	.-box-wrap{
	    transform: translateY( 0 );
		animation: bounce 250ms cubic-bezier(0.165, 0.840, 0.440, 1.000) infinite alternate;
	}
	.-box {
	    width: $cube-size;
	    height: $cube-size;
	    position: relative;
	    transform-style: preserve-3d;
	    transform: rotateX(-14deg) rotateY(-45deg) rotateZ(0deg);
	    
	    .wall{
			width: $cube-size;
			height: $cube-size;
			position: absolute;
			transition: all 1s ease-out;
			backface-visibility: hidden;
	    }
	    .front{
			background: $top;
			transform: rotateX(0deg) rotateY(0deg) translateZ($cube-size/2) rotateX(90deg);
			transform-origin: 50% 100%;
			height: 50%;
			z-index: 1;
	    }
	    .right{
			height: $cube-size;
			background: $top;
			transform-style: preserve-3d;
			transform: translateX($cube-size/2) rotateY(90deg) rotateX(90deg);
			transform-origin: 50% 100%;
			height: 50%;
			z-index: 1;
	    }
	    .back{
			background: $top;
			transform: rotateY(180deg) translateZ($cube-size/2) rotateX(90deg);
			transform-origin: 50% 100%;
			height: 50%;
	    }
	    .left{
			background: $top;
			transform: translateX(-$cube-size/2) rotateY(-90deg) rotateX(90deg);
			transform-origin: 50% 100%;
			height: 50%;
	    }
	    .front-left{
			background: $lightb;
			height: $cube-size;
			transform: rotateX(0deg) rotateY(0deg) translateZ($cube-size/2)  translateY($cube-size/2);
			transform-origin: 50% 100%;
	    }
	    .front-right{
			background: $darkb;
			height: $cube-size;
			transform: translateX($cube-size/2) rotateY(90deg)  translateY($cube-size/2);
			transform-origin: 50% 100%;
	    }
	    .back-left{
			background: $leftb;
			height: $cube-size;
			transform: rotateX(0deg) translateX(-$cube-size/2) rotateY(-90deg) translateY($cube-size/2);
			transform-origin: 50% 100%;
	    }
	    .back-right{
			background: $rightb;
			height: $cube-size;
			transform: rotateX(0deg)  rotateY(180deg) translateZ($cube-size/2) translateY($cube-size/2);
			transform-origin: 50% 100%;
	    }
	}
}
!

JS 

              
                function init() {
	var emitter = document.getElementById("emitter"),
		container = document.createElement("div"),
		emitterSize = 100,
		dotQuantity = 50,
		dotSizeMax = 100,
		dotSizeMin = 10,
		speed = 1,
		gravity = 1;
	
	container.setAttribute("id", "emit-wrap");
	//setup the container with the appropriate styles
    container.style.cssText = "position:absolute; left:0; top:0; overflow:visible; z-index:5000; pointer-events:none;";
	document.body.appendChild(container);
	
	function createExplosion(container) {
		var tl = new TimelineLite({
			onComplete: function() {
				$('#emit-wrap').remove();
			}
		}),
			angle, length, dot, i, size;
		//create all the dots
		for (i = 0; i < dotQuantity; i++) {
			dot = document.createElement("div");
			dot.className = "emitter-dot";
			size = getRandom(dotSizeMin, dotSizeMax);
			container.appendChild(dot);
			angle = Math.random() * Math.PI * 2; //random angle
			//figure out the maximum distance from the center, factoring in the size of the dot (it must never go outside the circle), and then pick a random spot along that length where we'll plot the point. 
			length = Math.random() * (emitterSize / 2 - size / 2);
			//place the dot at a random spot within the emitter, and set its size.
			TweenLite.set(dot, {
				x: Math.cos(angle) * length,
				y: Math.sin(angle) * length,
				width: size,
				height: size,
				xPercent: -50,
				yPercent: -50,
				force3D: true
			});
			//this is where we do the animation...
			tl.to(dot, 1 + Math.random(), {
				opacity: 0,

				//if you'd rather not do physics, you could just animate out directly by using the following 2 lines instead of the physics2D:
				x: Math.cos(angle) * length * 24,
				y: Math.sin(angle) * length * 24
			}, 0);
		}
		return tl;
	}
	
	function explode(element) {
		var explosion = createExplosion(container);
		// var bounds = element.getBoundingClientRect();

		var offset = $(element).offset();
		var width = $(element).width();
		var height = $(element).height();

		// TweenLite.set(container, {
		//     x: bounds.left + bounds.width / 2,
		//     y: bounds.top + bounds.height / 2
		// });
		TweenLite.set(container, {
			x: offset.left + width / 2,
			y: offset.top + height / 2
		});
		explosion.restart();
	}

	function getRandom(min, max) {
		return min + Math.random() * (max - min);
	}
	
	emitter.onmousedown = emitter.ontouchstart = function() {
		explode(emitter);
		$(emitter).hide();

		$('.-shadow').hide();
		$('.js-box-wrap').hide();
		setTimeout(function(){
			$('.js-trigger-reset').css({
				'display': 'inline-block'
			});
		}, 2000);
		

		var tl = new TimelineMax();
		tl.add("logo")
		.add(logoReveal,"logo");
	}
}

function logoReveal() {
	var logoReveal = new TimelineMax();
             
    logoReveal.to('.js-icon-logo', 1, {autoAlpha: 1, ease: Power4.easeOut});
              
    return logoReveal;
}

function reset() {
	$('.-shadow').attr('style', '');
	$('.js-box-wrap').attr('style', '');
	$('.js-icon-logo').attr('style', '');
	$('#emitter').attr('style', '');
	$('.js-trigger-reset').hide();
}

$(document).ready(function () {
	init();
	$('.js-trigger-reset').click(function() {
		reset();
		init();
	});
});
!
999px

Console