#baller {
    width: 100px;
    height: 100px;
    margin: 50px auto;
    position: relative;
    border-radius: 50%;
    background: linear-gradient(35deg, #CCFFFF, #FFCCCC);
    animation-name: bounce;
    animation-duration: 1s;
    animation-iteration-count: infinite;
}

@keyframes bounce {
    0% {
        top: 0px;
    }
    50% {
        top: 649px;
        width: 130px;
        height: 70px;
    }
    100% {
        top: 0px;
    }
}

#bark {
    position: absolute;
    z-index: -10;
    padding: 0;
    margin: 0;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(black, #000099, #66c2ff, #ffcccc, #ffeee6);
}