.snow-go{
    background: url(chudik.jpg) no-repeat #0182c6;
    position: relative;
    height: 800px;
    width: 534px;
    overflow: hidden;
    background-size:cover;
}

.snowbig{
   background-image: url(snowbig.png);
   position:absolute;
   width: 100%;
    height:800px;
    animation: snowbig 20s linear infinite;
}

.snowlittle{
    background-image: url(snowback.png),url(snowfront.png);
    animation: snowlittle 12s linear infinite;
    width: 100%;
    height:800px;
    position:absolute;
}

@keyframes snowlittle{
    0%{background-position: 0 0, 0 0;}
    100%{background-position: 10% 800px, 10% 800px;}
}
@keyframes snowbig{
    from{background-position: 0 -300px;}
    20% {background-position: 20% -100px;}
    40% {background-position: 30% 100px;}
    to{background-position: 20% 700px;}
}