body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #000;
}

#gameCanvas {
    background-color: lightblue;
    background-image: url('images/tree.gif');
    background-size: 300px auto;
    background-position: bottom right 50px;
    background-repeat: no-repeat;
}