.mario-container {
    position: relative;
    width: 500px;
    height: 500px;
    border: solid 10px black;
    margin: 0 auto;
    margin-top: 200px;
}

.mario-coin {
    position: relative;
    width: 70px;
    height: 70px;
    background-color: yellow;
    margin: 0 auto;
    margin-top: 100px;
    border-radius: 50%;
    animation: jumpCoin 0.8s linear infinite;
}

.mario-box {
    width: 100px;
    height: 100px;
    background-color: blue;
    margin: 0 auto;
    animation: jumpBox 0.5s linear infinite alternate;
}

@keyframes jumpCoin {
    0% {
        transform: translateY(0px);
        opacity: 1;
    }

    50% {
        transform: translateY(-100px) rotateY(180deg);
        opacity: 0;
    }

    100% {
        transform: translateY(-100px) rotateY(360deg);
        opacity: 0;
    }
}

@keyframes jumpBox {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}