body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #ffffff;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

#rain {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.raindrop {
    position: absolute;
    font-size: 24px;
    color: rgba(0, 0, 0, 0.7);
    user-select: none;
    animation: fall 10s linear infinite;
    opacity: 0.8;
}

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