.background-snow.snowing {
    background-image: url('/img/background/snow/s1.png'), url('/img/background/snow/s2.png'), url('/img/background/snow/s3.png');
    -webkit-animation: snow 10s linear infinite;
    -moz-animation: snow 10s linear infinite;
    -ms-animation: snow 10s linear infinite;
    animation: snow 10s linear infinite;
}
.background-snow .background .left {
    background-image: url('/img/background/snow/left.png');
    background-position: left bottom;
    background-repeat: no-repeat;
    width: 100vw;
    height: 100vh;
    left: 0;
    position: fixed !important;
    z-index: 1;
}
.background-snow .background .right {
    background-image: url('/img/background/snow/right.png');
    background-position: right bottom;
    background-repeat: no-repeat;
    width: 100vw;
    height: 100vh;
    right: 0;
    position: fixed !important;
    z-index: 0;
}
.background-snow .cloud-formation {
    display: none;
}
@keyframes snow {
    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;}
}
@-moz-keyframes snow {
    0% {background-position: 0px 0px, 0px 0px, 0px 0px;}
    50% {background-position: 500px 500px, 100px 200px, -100px 150px;}
    100% {background-position: 400px 1000px, 200px 400px, 100px 300px;}
}
@-webkit-keyframes snow {
    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;}
}
@-ms-keyframes snow {
    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;}
}