body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.sky {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-image: url('sky.png');
    background-size: cover;
    background-position: center;
    z-index: 1;
}

.city-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-image: url('city_background.png');
    background-size: 2000px 100vh; /* Set the background size to a large value to allow for repetition */
    background-position: 0% center;
    background-repeat: repeat-x; /* Repeat the background image horizontally */
    z-index: 2;
    animation: background-move 120s linear infinite;
}

.city-foreground {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-image: url('city_foreground.png');
    background-size: 2000px 100vh; /* Set the background size to a large value to allow for repetition */
    background-position: 0% center;
    background-repeat: repeat-x; /* Repeat the background image horizontally */
    z-index: 3;
    animation: foreground-move 90s linear infinite;
}

@keyframes background-move {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: -2000px center;
    }
}

@keyframes foreground-move {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: -2500px center;
    }
}