/* Pluie néon */
.neon-rain {
    position: absolute;
    width: 5px;
    height: 100px;
    background: white;
    box-shadow: 0 0 10px white, 0 0 20px white;
    animation: rain-fall 2s linear infinite;
    z-index: 1;
}

@keyframes rain-fall {
    0% {
        transform: translateY(-500vh);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}