.snowflake {
    position: fixed;
    top: -10px;
    color: white;
    font-size: 20px;
    z-index: 9999;
    pointer-events: none;
    animation-name: fall;
    animation-duration: 30s;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
    opacity: 10;
    opacity: 0.5;
}

@keyframes fall {
    0% { opacity: 0.8; transform: translateY(0); }
    100% { opacity: 0.4; transform: translateY(100vh); }
}