body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #000;
    color: #fff;
    font-family: 'Press Start 2P', cursive;
}
#gameCanvas {
    border: 2px solid #fff;
    background-color: #111;
}
#instructions {
    margin-top: 20px;
    text-align: center;
}
#score {
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 16px;
}