#snow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 9999;
}

.snowflake {
    position: absolute;
    top: -10px;
    color: #fff;
    animation: fall linear infinite;
}

@keyframes fall {
    0% {
        transform: translateY(-10px);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}