#cloud-1 {
    top: 1vw;
    width: 7vw;
    animation-duration: 80s;
    animation-delay: -22s;
}

#cloud-2 {
    top: 3vw;
    width: 5vw;
    animation-duration: 74.4s;
    animation-delay: -54s;
}

#cloud-3 {
    top: 6.0vw;
    width: 11vw;
    animation-duration: 65.2s;
    animation-delay: -6s;
}

#cloud-4 {
    top: 11.9vw;
    width: 15vw;
    animation-duration: 54.4s;
    animation-delay: -40s;
}

#cloud-5 {
    top: 5.8vw;
    width: 5vw;
    animation-duration: 50.6s;
    animation-delay: -32s;
}

#cloud-6 {
    top: 2.7vw;
    width: 7vw;
    animation-duration: 45.8s;
    animation-delay: -22s;
}

#cloud-7 {
    top: 1.6vw;
    width: 7vw;
    animation-duration: 80s;
    animation-delay: -62s;
}

#cloud-8 {
    top: 13.5vw;
    width: 5vw;
    animation-duration: 42.4s;
    animation-delay: -20s;
}

#cloud-9 {
    top: 8.4vw;
    width: 11vw;
    animation-duration: 61.2s;
    animation-delay: -38s;
}

#cloud-10 {
    top: 13.3vw;
    width: 13vw;
    animation-duration: 58.4s;
    animation-delay: -40s;
}

#cloud-11 {
    top: 1.2vw;
    width: 5vw;
    animation-duration: 48.6s;
    animation-delay: -2s;
}

#cloud-12 {
    top: 5.1vw;
    width: 7vw;
    animation-duration: 47.8s;
    animation-delay: -3s;
}