Snowflake effect in your website

index.html

<style>
    .snowflake {
        color: #fff;
        font-size: 1em;
        font-family: Arial;
        text-shadow: 0 0 1px #000;
    }

    @-webkit-keyframes snowflakes-fall {
        0% {
            top: -10%
        }

        100% {
            top: 100%
        }
    }

    @-webkit-keyframes snowflakes-shake {
        0% {
            -webkit-transform: translateX(0px);
            transform: translateX(0px)
        }

        50% {
            -webkit-transform: translateX(80px);
            transform: translateX(80px)
        }

        100% {
            -webkit-transform: translateX(0px);
            transform: translateX(0px)
        }
    }

    @keyframes snowflakes-fall {
        0% {
            top: -10%
        }

        100% {
            top: 100%
        }
    }

    @keyframes snowflakes-shake {
        0% {
            transform: translateX(0px)
        }

        50% {
            transform: translateX(80px)
        }

        100% {
            transform: translateX(0px)
        }
    }

    .snowflake {
        position: fixed;
        top: -10%;
        z-index: 9999;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        cursor: default;
        -webkit-animation-name: snowflakes-fall, snowflakes-shake;
        -webkit-animation-duration: 10s, 3s;
        -webkit-animation-timing-function: linear, ease-in-out;
        -webkit-animation-iteration-count: infinite, infinite;
        -webkit-animation-play-state: running, running;
        animation-name: snowflakes-fall, snowflakes-shake;
        animation-duration: 10s, 3s;
        animation-timing-function: linear, ease-in-out;
        animation-iteration-count: infinite, infinite;
        animation-play-state: running, running
    }

    .snowflake:nth-of-type(0) {
        left: 1%;
        -webkit-animation-delay: 0s, 0s;
        animation-delay: 0s, 0s
    }

    .snowflake:nth-of-type(1) {
        left: 10%;
        -webkit-animation-delay: 1s, 1s;
        animation-delay: 1s, 1s
    }

    .snowflake:nth-of-type(2) {
        left: 20%;
        -webkit-animation-delay: 6s, .5s;
        animation-delay: 6s, .5s
    }

    .snowflake:nth-of-type(3) {
        left: 30%;
        -webkit-animation-delay: 4s, 2s;
        animation-delay: 4s, 2s
    }

    .snowflake:nth-of-type(4) {
        left: 40%;
        -webkit-animation-delay: 2s, 2s;
        animation-delay: 2s, 2s
    }

    .snowflake:nth-of-type(5) {
        left: 50%;
        -webkit-animation-delay: 8s, 3s;
        animation-delay: 8s, 3s
    }

    .snowflake:nth-of-type(6) {
        left: 60%;
        -webkit-animation-delay: 6s, 2s;
        animation-delay: 6s, 2s
    }

    .snowflake:nth-of-type(7) {
        left: 70%;
        -webkit-animation-delay: 2.5s, 1s;
        animation-delay: 2.5s, 1s
    }

    .snowflake:nth-of-type(8) {
        left: 80%;
        -webkit-animation-delay: 1s, 0s;
        animation-delay: 1s, 0s
    }

    .snowflake:nth-of-type(9) {
        left: 90%;
        -webkit-animation-delay: 3s, 1.5s;
        animation-delay: 3s, 1.5s
    }
</style>

<div class="snowflakes" aria-hidden="true">
    <div class="snowflake"> ❅ </div>
    <div class="snowflake"> ❅ </div>
    <div class="snowflake"> ❆ </div>
    <div class="snowflake"> ❄ </div>
    <div class="snowflake"> ❅ </div>
    <div class="snowflake"> ❆ </div>
    <div class="snowflake"> ❄ </div>
    <div class="snowflake"> ❅ </div>
    <div class="snowflake"> ❆ </div>
    <div class="snowflake"> ❄ </div>
</div>