<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>
body{
  background: #000;
}
.snowflake {
    color: #fff;
    font-size: 1em;
    font-family: Arial;
    text-shadow: 0 0 1px #000;
    position: fixed;
    top: -10%;
    z-index: 9999;
    user-select: none;
    cursor: default;
    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%;
    animation-delay: 0s, 0s;
}

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

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

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

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

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

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

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

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

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

@keyframes snowflakes-fall {
    0% {
        top: -10%;
    }
    100% {
        top: 100%;
    }
}

@keyframes snowflakes-shake {
    0% {
        transform: translateX(0px);
        -webkit-transform: translateX(0px);
        -moz-transform: translateX(0px);
        -o-transform: translateX(0px);
        -ms-transform: translateX(0px);
    }
    50% {
        transform: translateX(80px);
        -webkit-transform: translateX(80px);
        -moz-transform: translateX(80px);
        -o-transform: translateX(80px);
        -ms-transform: translateX(80px);
    }
    100% {
        transform: translateX(0px);
        -webkit-transform: translateX(0px);
        -moz-transform: translateX(0px);
        -o-transform: translateX(0px);
        -ms-transform: translateX(0px);
    }
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.