body {
    margin: 0;
    overflow: hidden;
    text-align: center;
    font-family: Arial, sans-serif;
    background: url("background.jpg") no-repeat center center fixed;
    background-size: cover;
}
canvas {
    display: block;
    margin: auto;
}
#scoreboard {
    position: absolute;
    top: 10px;
    left: 10px;
    color: white;
    font-size: 20px;
}