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HTML

              
                <div class="content">
  <div class="title">
    <h1>Happy Holidays</h1>
    <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" width="411.438px" height="74.257px" viewBox="0 0 411.438 74.257" enable-background="new 0 0 411.438 74.257" xml:space="preserve">
<g>
	<path fill="#FFFFFF" d="M25.857 18.232c4.618 0 8.85 1.67 12.14 4.429l4.472-5.33c-4.496-3.779-10.29-6.061-16.61-6.061 C11.6 11.27 0 22.87 0 37.128c0 14.26 11.6 25.86 25.86 25.856c6.32 0 12.114-2.282 16.61-6.061l-4.472-5.33 c-3.286 2.761-7.521 4.429-12.139 4.429c-10.419 0-18.896-8.476-18.896-18.894C6.962 26.71 15.44 18.23 25.86 18.232z"/>
	<path fill="#FFFFFF" d="M168.993 12.763H155.07c-1.922 0-3.48 1.559-3.48 3.48v41.769c0 1.92 1.56 3.48 3.48 3.48h13.923 c13.436 0 24.365-10.93 24.365-24.365C193.358 23.69 182.43 12.76 168.99 12.763z M168.993 54.532h-10.442V19.725h10.442 c9.597 0 17.4 7.81 17.4 17.404C186.397 46.73 178.59 54.53 168.99 54.532z"/>
	<path fill="#FFFFFF" d="M212.206 16.244v41.769c0 1.92 1.56 3.48 3.48 3.48h29.007v-6.961h-25.525V40.608h16.243v-6.961h-16.243 V19.725h25.525v-6.961h-29.007C213.765 12.76 212.21 14.32 212.21 16.244z"/>
	<path fill="#FFFFFF" d="M317.569 16.244v41.769c0 1.92 1.56 3.48 3.48 3.48h29.006v-6.961H324.53V40.608h16.244v-6.961H324.53 V19.725h25.525v-6.961H321.05C319.128 12.76 317.57 14.32 317.57 16.244z"/>
	<path fill="#FFFFFF" d="M284.443 12.763h-15.084c-1.922 0-3.48 1.559-3.48 3.48v45.25h6.962V40.608h11.603 c7.677 0 13.923-6.246 13.923-13.922C298.366 19.01 292.12 12.76 284.44 12.763z M284.443 33.647h-11.603V19.725h11.603 c3.839 0 6.96 3.12 6.96 6.961S288.282 33.65 284.44 33.647z"/>
	<path fill="#FFFFFF" d="M404.476 12.763v35.636l-28.652-34.384c-0.938-1.127-2.481-1.545-3.859-1.045 c-1.378 0.5-2.296 1.808-2.296 3.273v45.25h6.962V25.858l28.652 34.383c0.675 0.81 1.66 1.25 2.67 1.25 c0.396 0 0.797-0.066 1.185-0.207c1.378-0.5 2.296-1.808 2.296-3.273v-45.25H404.476z"/>
	<path fill="#FFFFFF" d="M131.815 25.261c-0.017-0.09-0.032-0.18-0.056-0.268c-0.015-0.053-0.033-0.103-0.05-0.155 c-0.025-0.078-0.051-0.156-0.082-0.232c-0.022-0.053-0.047-0.104-0.071-0.155c-0.034-0.072-0.069-0.143-0.109-0.212 c-0.028-0.051-0.06-0.099-0.091-0.148c-0.043-0.066-0.087-0.131-0.135-0.194c-0.035-0.047-0.071-0.092-0.109-0.137 c-0.05-0.06-0.104-0.117-0.158-0.173c-0.042-0.042-0.084-0.084-0.128-0.125c-0.058-0.053-0.118-0.103-0.181-0.151 c-0.048-0.037-0.095-0.075-0.145-0.109c-0.018-0.013-0.034-0.028-0.053-0.04L96.511 0.536c-1.071-0.715-2.468-0.715-3.539 0 L59.034 23.161c-0.019 0.012-0.034 0.027-0.053 0.04c-0.05 0.035-0.097 0.072-0.145 0.109c-0.062 0.049-0.123 0.099-0.181 0.15 c-0.044 0.04-0.086 0.082-0.127 0.125c-0.056 0.056-0.108 0.113-0.159 0.173c-0.038 0.045-0.074 0.09-0.109 0.14 c-0.048 0.063-0.092 0.127-0.135 0.194c-0.031 0.049-0.062 0.097-0.091 0.148c-0.04 0.069-0.075 0.14-0.108 0.21 c-0.024 0.051-0.05 0.103-0.071 0.155c-0.031 0.076-0.058 0.154-0.083 0.232c-0.017 0.052-0.035 0.103-0.049 0.15 c-0.023 0.088-0.04 0.177-0.056 0.268c-0.009 0.046-0.02 0.091-0.026 0.138c-0.018 0.138-0.028 0.276-0.028 0.417V48.44 c0 0.14 0.01 0.28 0.03 0.417c0.007 0.05 0.02 0.09 0.03 0.138c0.016 0.09 0.03 0.18 0.06 0.27 c0.014 0.05 0.03 0.1 0.05 0.155c0.025 0.08 0.05 0.16 0.08 0.233c0.021 0.05 0.05 0.1 0.07 0.15 c0.033 0.07 0.07 0.14 0.11 0.213c0.028 0.05 0.06 0.1 0.09 0.146c0.043 0.07 0.09 0.13 0.14 0.19 c0.035 0.05 0.07 0.09 0.11 0.138c0.051 0.06 0.1 0.12 0.16 0.173c0.041 0.04 0.08 0.09 0.13 0.12 c0.058 0.05 0.12 0.1 0.18 0.152c0.048 0.04 0.1 0.07 0.14 0.109c0.019 0.01 0.03 0.03 0.05 0.039L92.972 73.72 c0.536 0.36 1.15 0.54 1.77 0.537s1.234-0.18 1.77-0.537l33.938-22.625c0.019-0.012 0.035-0.026 0.053-0.039 c0.05-0.035 0.097-0.072 0.145-0.109c0.062-0.049 0.123-0.1 0.181-0.152c0.044-0.039 0.086-0.082 0.128-0.124 c0.055-0.056 0.108-0.113 0.158-0.173c0.038-0.045 0.074-0.09 0.109-0.138c0.048-0.063 0.092-0.128 0.135-0.194 c0.031-0.048 0.062-0.097 0.091-0.146c0.04-0.07 0.075-0.141 0.109-0.213c0.024-0.051 0.049-0.102 0.071-0.154 c0.031-0.077 0.057-0.155 0.082-0.233c0.017-0.052 0.035-0.103 0.05-0.155c0.023-0.088 0.039-0.178 0.056-0.268 c0.008-0.046 0.02-0.091 0.025-0.138c0.018-0.138 0.028-0.276 0.028-0.417V25.816c0-0.141-0.011-0.279-0.028-0.417 C131.835 25.35 131.82 25.31 131.81 25.261z M94.741 44.677l-11.285-7.548l11.285-7.549l11.286 7.549L94.741 44.677z M91.551 24.037L77.717 33.29L66.55 25.82L91.551 9.153V24.037z M71.978 37.128l-7.982 5.339V31.789L71.978 37.128z M77.717 40.97 l13.834 9.252v14.884L66.55 48.437L77.717 40.968z M97.932 50.22l13.834-9.252l11.168 7.469L97.932 65.104V50.22z M117.505 37.13 l7.983-5.34v10.679L117.505 37.128z M111.766 33.29l-13.834-9.252V9.153l25.002 16.667L111.766 33.29z"/>
</g>
</svg>
    <h2>Love,</h2>
    <h2>Sean Dempsey</h2>
  </div>
</div>
<audio src="//katiebaca.com/codepen/merry-christmas-mr-lawrence.mp3" autoplay loop></audio>

              
            
!

CSS

              
                body {
  background: linear-gradient(#00001C, #00000C);
  color: white;
  font-family: 'Petit Formal Script', cursive;
  overflow:hidden;
}

.content {
  width:100%;
  overflow:hidden; 

  
  .title {
    position: absolute;
    text-align: center;
    top:50%;
    left:50%;
    transform: translate3d(-50%, -50%, 0);
    z-index: 0;
    font-size: 1.5em;
    
  svg {
    display:block;
    max-width: 100%;
  }
    
    h2 {
      text-align:left;
      
      &:nth-of-type(2) {
        margin-left: 2em;
      }
    }
  }
}
              
            
!

JS

              
                function randomRange(min, max) {
	return ((Math.random()*(max-min)) + min); 
}

var SCREEN_WIDTH = window.innerWidth;
var SCREEN_HEIGHT = window.innerHeight;

var container;

var particle;

var camera;
var scene;
var renderer;

var mouseX = 0;
var mouseY = 0;

var windowHalfX = window.innerWidth / 2;
var windowHalfY = window.innerHeight / 2;

var particles = []; 
var particleImage = new Image();
particleImage.src = 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/82015/snowflake.png'; 



function init() {

	container = document.createElement('div');
	document.body.appendChild(container);

	camera = new THREE.PerspectiveCamera( 75, SCREEN_WIDTH / SCREEN_HEIGHT, 1, 10000 );
	camera.position.z = 1000;

	scene = new THREE.Scene();
	scene.add(camera);
		
	renderer = new THREE.CanvasRenderer();
	renderer.setSize(SCREEN_WIDTH, SCREEN_HEIGHT);
	var material = new THREE.ParticleBasicMaterial( { map: new THREE.Texture(particleImage) } );
		
	for (var i = 0; i < 1000; i++) {

		particle = new Particle3D( material);
		particle.position.x = Math.random() * 2000 - 1000;
		particle.position.y = Math.random() * 2000 - 1000;
		particle.position.z = Math.random() * 2000 - 1000;
		particle.scale.x = particle.scale.y =  1;
		scene.add( particle );
		
		particles.push(particle); 
	}

	container.appendChild( renderer.domElement );


	document.addEventListener( 'mousemove', onDocumentMouseMove, false );
	document.addEventListener( 'touchstart', onDocumentTouchStart, false );
	document.addEventListener( 'touchmove', onDocumentTouchMove, false );
	
	setInterval( loop, 1000 / 60 );
	
}

function onDocumentMouseMove( event ) {

	mouseX = event.clientX - windowHalfX;
	mouseY = event.clientY - windowHalfY;
}

function onDocumentTouchStart( event ) {

	if ( event.touches.length == 1 ) {

		event.preventDefault();

		mouseX = event.touches[ 0 ].pageX - windowHalfX;
		mouseY = event.touches[ 0 ].pageY - windowHalfY;
	}
}

function onDocumentTouchMove( event ) {

	if ( event.touches.length == 1 ) {

		event.preventDefault();

		mouseX = event.touches[ 0 ].pageX - windowHalfX;
		mouseY = event.touches[ 0 ].pageY - windowHalfY;
	}
}

function loop() {

for (var i = 0; i < particles.length; i++)	{

		var particle = particles[i]; 
		particle.updatePhysics(); 

		with(particle.position) {
			if ( y < -1000) y += 2000; 
			if (x > 1000) x -= 2000; 
			else if (x < -1000) x += 2000; 
			if (z > 1000) z -= 2000; 
			else if (z<-1000) z += 2000; 
		}				
	}

	camera.position.x += ( mouseX - camera.position.x ) * 0.05;
	camera.position.y += ( - mouseY - camera.position.y ) * 0.05;
	camera.lookAt(scene.position); 

	renderer.render( scene, camera );		
}

init();

              
            
!
999px

Console