@keyframes cloud1 {
    0% {
        left: 0%;
    }

    100% {
        left: 100%;
    }
}

@keyframes sun {
    0% {
        transform: rotateZ(-30deg);
    }

    50% {
        transform: rotateZ(30deg);
    }

    51% {
        transform: rotateZ(90deg);
    }

    100% {
        transform: rotateZ(180deg);
    }
}

@keyframes backgrounds {
    10% {
        background-color: #b1e1e2;
    }

    30% {
        background-color: #fcd2e2;
    }

    50% {
        background-color: #636888;
    }

    100% {
        background-color: #1a1b20;
    }
}

#wrap {
    background-color: #b1e1e2;
    width: 100%;
    height: 100%;
    position: absolute;
    animation: backgrounds 20s linear 0s infinite forwards;
}

#section {
    position: absolute;
    width: 1000px;
    height: 400px;

    top: 50%;
    left: 50%;

    transform: translate(-50%, -50%);
    overflow: hidden;
}

#section .section-sky img {
    position: absolute;
}

#section .section-sky img:nth-child(1) {
    left: 10%;
    top: 10%;
    animation: cloud1 20s linear 0s infinite forwards;
}

#section .section-sky img:nth-child(2) {
    top: 20%;
    animation: cloud1 20s linear 0s infinite forwards;
}

#section .section-sky img:nth-child(3) {
    width: 150px;
    left: 50%;
    transform: translateX(-50%);
    animation: sun 20s linear 0s infinite forwards;

    transform-origin: center 1500px;
}

#section .section-town {
    position: absolute;
    width: 100%;
    height: 100%;
}

#section .section-town img:nth-child(1) {
    width: 100%;
    position: absolute;
    bottom: 0;
}

#section .section-people {
    position: absolute;
    width: 100%;
    height: 100%;
}

#section .section-people img {
    position: absolute;
    bottom: 0;
}

#section .section-people img:nth-child(1) {
    animation: cloud1 20s linear 0s infinite forwards;
}

#section .section-people img:nth-child(2) {
    animation: cloud1 10s linear 0s infinite forwards;
}