下雪效果

CSS

.snow-container {
position: fixed;
top:0;
left:0;
right: 0;
bottom:0;
overflow: hidden;
z-index: 2;
pointer-events: none;
background-color: none;
}

.snow {
display: block;
position: absolute;
z-index: 2;
top: 0;
right: 0;
bottom: 0;
left: 0;
pointer-events: none;
-webkit-transform: translate3d(0, -100%, 0);
transform: translate3d(0, -100%, 0);
-webkit-animation: snow linear infinite;
animation: snow linear infinite;
}
.snow.foreground {
background-image: url(“https://dl6rt3mwcjzxg.cloudfront.net/assets/snow/snow-large-075d267ecbc42e3564c8ed43516dd557.png”);
-webkit-animation-duration: 15s;
animation-duration: 15s;
}
.snow.foreground.layered {
-webkit-animation-delay: 7.5s;
animation-delay: 7.5s;
}
.snow.middleground {
background-image: url(https://dl6rt3mwcjzxg.cloudfront.net/assets/snow/snow-medium-0b8a5e0732315b68e1f54185be7a1ad9.png);
-webkit-animation-duration: 20s;
animation-duration: 20s;
}
.snow.middleground.layered {
-webkit-animation-delay: 10s;
animation-delay: 10s;
}
.snow.background {
background-image: url(https://dl6rt3mwcjzxg.cloudfront.net/assets/snow/snow-small-1ecd03b1fce08c24e064ff8c0a72c519.png);
-webkit-animation-duration: 30s;
animation-duration: 30s;
}
.snow.background.layered {
-webkit-animation-delay: 15s;
animation-delay: 15s;
}

@-webkit-keyframes snow {
0% {
-webkit-transform: translate3d(0, -100%, 0);
transform: translate3d(0, -100%, 0);
}
100% {
-webkit-transform: translate3d(15%, 100%, 0);
transform: translate3d(15%, 100%, 0);
}
}

@keyframes snow {
0% {
-webkit-transform: translate3d(0, -100%, 0);
transform: translate3d(0, -100%, 0);
}
100% {
-webkit-transform: translate3d(15%, 100%, 0);
transform: translate3d(15%, 100%, 0);
}
}
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