body { 
  background-image:url('http://www.clipartpal.com/_thumbs/pd/holiday/christmas/Christmas_card_Santa_moon.png'); 
  background-size:100% 100%; 
  height:100vh;
  background-repeat: no-repeat;
  overflow:hidden;
  margin:0;
  width:100%;
}
canvas{
  position:absolute;
  bottom:-5em;
  left:20vw;
  z-index:1;
}
#snowy{
	background: none;
	background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/131045/snow1.png'),
 url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/131045/snow2.png'), 
 url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/131045/snow3.png');
	height: 100%;
	left: 0;
	position: absolute;
	top: 0;
	width: 100%;
	z-index:2;
	animation: snowy 15s linear infinite;
}
@keyframes snowy {
  0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
  50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
  100% {background-position: 500px 1000px, 200px 400px, -100px 300px;}
}