body:before, body:after,
.more-snow:before,
.more-snow:after {
    content: "";
    position: fixed;
    top: -3000%;
    bottom: 0;
    right: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.01);
    background-image: url('4-2-white-snow-png.png');
    background-size: 30%;
    -webkit-animation-name: MOVE-BG;
    -webkit-animation-duration: 500s;
    -webkit-animation-timing-function: linear;
    -webkit-animation-iteration-count: infinite;
}

body:before {
    filter: blur(6px);
    opacity: 0.8;
}
body:after {
    filter: blur(1px);
    top: -1500%;
    background-image: url('4-2-white-snow-png.png');
    background-size: 90%;
    -webkit-animation-duration: 200s;
    animation-duration: 200s;
}

.more-snow:before {
    filter: blur(4px);
    opacity: 0.8;
    top: -2500%;
    background-size: 60%;
    -webkit-animation-duration: 400s;
    animation-duration: 400s;
}
.more-snow:after {
    filter: blur(2px);
    opacity: 0.8;
    top: -2000%;
    background-image: url('4-2-white-snow-png.png');
    background-size: 70%;
    -webkit-animation-duration: 300s;
    animation-duration: 300s;
}

@-webkit-keyframes MOVE-BG {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(70%);
    }
}