body {
    background: none;
}

#ground {
    background-color: #ffe4b2;
    width: 500px;
    height: 500px;
    border: 1px solid #000000;
    margin: 100px auto auto auto;
    position: relative;
    z-index: 0;
}

#player {
    background-color: skyblue;
    width: 50px;
    height: 50px;
    border: 0px solid #000000;
    position: relative;
    top: 0px;
    left: 0px;
    z-index: 1;
}