#snowflakes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}
.snowflake {
    position: absolute;
    top: -10px;
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    opacity: 0.8;
    animation: snowfall linear infinite;
}
@keyframes snowfall {
    to {
        transform: translateY(100vh);
    }
}