.rain {
    position: absolute;
    top: -20px;
    width: 1px;
    height: 50px;
    background: linear-gradient(to bottom,
            transparent,
            #ff00ff,
            #00ffff,
            #ff00ff,
            transparent);
    opacity: 0;
    animation: rainFall 3s linear infinite;
}

.rain:nth-child(1) {
    left: 0px;
    animation: rainFall 3s linear infinite;
    animation-delay: 0s;
}

.rain:nth-child(2) {
    left: -500px;
    animation: rainFall 2s linear infinite;
    animation-delay: 0.1s;
}

.rain:nth-child(3) {
    left: -300px;
    animation: rainFall 1s linear infinite;
    animation-delay: 0.2s;
}

.rain:nth-child(4) {
    left: 10%;
    animation: rainFall 1s linear infinite;
    animation-delay: 0.5s;
}

.rain:nth-child(5) {
    left: 20%;
    animation: rainFall 1s linear infinite;
    animation-delay: 0.5s;
}

.rain:nth-child(6) {
    left: 40%;
    animation: rainFall 1s linear infinite;
    animation-delay: 0.5s;
}

.rain:nth-child(7) {
    left: 50%;
    animation: rainFall 2s linear infinite;
    animation-delay: 0.5s;
}

.rain:nth-child(8) {
    left: 60%;
    animation: rainFall 1.2s linear infinite;
    animation-delay: 0.5s;
}

.rain:nth-child(9) {
    left: 70%;
    animation: rainFall 1.5s linear infinite;
    animation-delay: 2s;
}

.rain:nth-child(10) {
    left: 90%;
    animation: rainFall 0.8s linear infinite;
    animation-delay: 0s;
}

.rain:nth-child(11) {
    left: -700px;
    animation: rainFall 1.2s linear infinite;
    animation-delay: 0.2s;
}

.rain:nth-child(12) {
    left: -600px;
    animation: rainFall 0.8s linear infinite;
    animation-delay: 0.3s;
}

.rain:nth-child(13) {
    left: 30%;
    animation: rainFall 0.9s linear infinite;
    animation-delay: 0.8s;
}

.rain:nth-child(14) {
    left: -300px;
    animation: rainFall 0.7s linear infinite;
    animation-delay: 0.2s;
}

.rain:nth-child(15) {
    left: 70%;
    animation: rainFall 0.5s linear infinite;
    animation-delay: 0.4s;
}

@keyframes rainFall {
    0% {
        transform: translateY(0) translateX(100vh) rotate(45deg);
        opacity: 0.5;
    }

    100% {
        transform: translateY(110vh) translateX(0) rotate(45deg);
        opacity: 1;
    }
}