style.css

/* GLOBAL ADJUSTMENTS */
* {
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
}

/* NUMERIC ADJUSTMENT */
:root {
    font-size: 62.5%;
}

/* BODY SETUP */
body {
    background-image: url(./assets/fundo.svg);
    background-repeat:repeat-x;
}

/* LIST OF HOLES SETUP */
.holes {
    display: grid;
    gap: 5.4rem;
    grid-template-areas:
    "A B C D"
    "E F G H"
    "I J K L";
    
    margin: 22.5rem 24.5rem 18.7rem 18.8rem;

    width: 90%;
    position: relative;

    list-style: none;
    z-index: 0;
}

/* HOLE SETUP */
.hole {
    background-image: url(./assets/toupeira6.svg);
    width: 22.2rem;
    height: 17.2rem;
}

/* ANIMATION PER HOLE SETUP */
.holes div {
    animation-name: fade-in;
    animation-duration: 2s;
    animation-iteration-count: var(1 + 2s);
}

/* BELOW ARE ANIMATION DELAYS FOR EACH HOLE */
.holes .hole:nth-child(1) {
    animation-delay: 2s;
}

.holes .hole:nth-child(2) {
    animation-delay: 18s;
}

.holes .hole:nth-child(3) {
    animation-delay: 10s;
}

.holes .hole:nth-child(4) {
    animation-delay: 4s;
}

.holes .hole:nth-child(5) {
    animation-delay: 6s;
}

.holes .hole:nth-child(6) {
    animation-delay: 14s;
}

.holes .hole:nth-child(7) {
    animation-delay: 24s;
}

.holes .hole:nth-child(8) {
    animation-delay: 22s;
}

.holes .hole:nth-child(9) {
    animation-delay: 12s;
}

.holes .hole:nth-child(10) {
    animation-delay: 20s;
}

.holes .hole:nth-child(11) {
    animation-delay: 8s;
}

.holes .hole:nth-child(12) {
    animation-delay: 16s;
}

/* ANIMATIONS */
@keyframes fade-in {
    0% {
       background-image: url(./assets/toupeira1.svg);
    }

    20% {
        background-image: url(./assets/toupeira2.svg);
    }

    30%, 50% {
        background-image: url(./assets/toupeira3.svg);
    }

    60% {
        background-image: url(./assets/toupeira4.svg);
    }

    80% {
        background-image: url(./assets/toupeira5.svg);
    }

    100% {
        background-image: url(./assets/toupeira6.svg);
    }
}