body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

#background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #2c3e50;
    pointer-events: none;
}

.raindrop {
    position: absolute;
    background-color: #77aaff;
    border-radius: 50%;
    pointer-events: none;
    animation: fall linear infinite;
}

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

    50% {
        opacity: 1;
    }

    100% {
        transform: translateY(calc(100vh + 100px));
        opacity: 0;
    }
}