.snow-bg {
    position: relative;
 }
 
 .snow-bg:after {
    content: '';
    display: block;
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    background-image: url('https://library.elementor.com/resources/christmas-snow-effect/s1.png'), url('https://library.elementor.com/resources/christmas-snow-effect/s2.png'), url('https://library.elementor.com/resources/christmas-snow-effect/s3.png');
     animation: snow 10s linear infinite;
 }
 
 @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;}
 }