body:before {
    content:"";
	background-image: url('http://i.imgur.com/JPvHX4P.png'), url('http://i.imgur.com/09mUEfc.png'), url('http://i.imgur.com/UR544aO.png');
    -webkit-animation: snow 10s linear infinite;
    -moz-animation: snow 10s linear infinite;
    -ms-animation: snow 10s linear infinite;
    animation: snow 10s linear infinite;
	z-index: -1;
	position: fixed;
    width: 100%;
    height: 100%;
	left: 0;
}

/*Keyframes*/
@keyframes snow {
0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
 100% {background-position: 500px 1000px, 400px 400px, 300px 300px;}
}
 
@-moz-keyframes snow {
0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
100% {background-position: 500px 1000px, 400px 400px, 300px 300px;}
}
 
@-webkit-keyframes snow {
0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
 50% {/*background-color:#b4cfe0;*/}
 100% {background-position: 500px 1000px, 400px 400px, 300px 300px; /*background-color:#6b92b9;*/}
}
 
@-ms-keyframes snow {
0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
 100% {background-position: 500px 1000px, 400px 400px, 300px 300px;}
}