/* source : https://codepen.io/iautomation/pen/VYexBz */
.snowflakes {
    width: 100%;
    height: 1200px;
    position: absolute;
    top: -90px;
    left: 0;
}

i,
i:after,
i:before {
    background: white;
}
i {
    display: inline-block;
    animation: snowflakes 3s linear 2s 20;
    -webkit-animation: snowflakes 3s linear 2s 20;
    -moz-animation: snowflakes 3s linear 2s 20;
    position: relative;
}
i:after,
i:before {
    height: 100%;
    width: 100%;
    content: ".";
    position: absolute;
    top: 0px;
    left: 0px;
    transform: rotate(120deg);
    -webkit-transform: rotate(120deg);
}
i:before {
    transform: rotate(240deg);
    -webkit-transform: rotate(240deg);
}

@keyframes snowflakes {
    0% {
        -webkit-transform: translate3d(0, 0, 0) rotate(0deg) scale(0.6);
    }
    100% {
        -webkit-transform: translate3d(15px, 1200px, 0px) rotate(360deg)
            scale(0.6);
    }
}
@-webkit-keyframes snowflakes {
    0% {
        -webkit-transform: translate3d(0, 0, 0) rotate(0deg) scale(0.6);
    }
    100% {
        -webkit-transform: translate3d(15px, 1200px, 0px) rotate(360deg)
            scale(0.6);
    }
}

.snowflakes i:nth-child(3n) {
    width: 16px;
    height: 4px;
    animation-duration: 4s;
    -webkit-animation-duration: 4s;
    animation-iteration-count: 30;
    -webkit-animation-iteration-count: 30;
    transform-origin: right -45px;
    -webkit-transform-origin: right -45px;
}

.snowflakes i:nth-child(3n + 1) {
    width: 24px;
    height: 6px;
    animation-duration: 6s;
    -webkit-animation-duration: 6s;
    animation-iteration-count: 45;
    -webkit-animation-iteration-count: 45;
    transform-origin: right -30px;
    -webkit-transform-origin: right -30px;
}

.snowflakes i:nth-child(3n + 2) {
    width: 32px;
    height: 8px;
    animation-duration: 8s;
    -webkit-animation-duration: 8s;
    animation-iteration-count: 60;
    -webkit-animation-iteration-count: 60;
    transform-origin: right -15px;
    -webkit-transform-origin: right -15px;
}

/* different delays so they don't all start at the same time */
.snowflakes i:nth-child(7n) {
    opacity: 0.3;
    animation-delay: 0s;
    -webkit-animation-delay: 0s;
    animation-timing-function: ease-in;
    -webkit-animation-timing-function: ease-in;
}
.snowflakes i:nth-child(7n + 1) {
    opacity: 0.4;
    animation-delay: 1s;
    -webkit-animation-delay: 1s;
    animation-timing-function: ease-out;
    -webkit-animation-timing-function: ease-out;
}
.snowflakes i:nth-child(7n + 2) {
    opacity: 0.5;
    animation-delay: 1.5s;
    -webkit-animation-delay: 1.5s;
    animation-timing-function: linear;
    -webkit-animation-timing-function: linear;
}
.snowflakes i:nth-child(7n + 3) {
    opacity: 0.6;
    animation-delay: 2s;
    -webkit-animation-delay: 2s;
    animation-timing-function: ease-in;
    -webkit-animation-timing-function: ease-in;
}
.snowflakes i:nth-child(7n + 4) {
    opacity: 0.7;
    animation-delay: 2.5s;
    -webkit-animation-delay: 2.5s;
    animation-timing-function: linear;
    -webkit-animation-timing-function: linear;
}
.snowflakes i:nth-child(7n + 5) {
    opacity: 0.8;
    animation-delay: 3s;
    -webkit-animation-delay: 3s;
    animation-timing-function: ease-out;
    -webkit-animation-timing-function: ease-out;
}
.snowflakes i:nth-child(7n + 6) {
    opacity: 0.9;
    animation-delay: 3.5s;
    -webkit-animation-delay: 3.5s;
    animation-timing-function: ease-in;
    -webkit-animation-timing-function: ease-in;
}