body {
    background: #222;
    color: #fff;
    font-family: Arial, sans-serif;
    text-align: center;
}

#gameContainer {
    margin: 30px auto;
    width: 800px;
    background: #111;
    border: 2px solid #444;
    border-radius: 10px;
    box-shadow: 0 0 30px #0008;
    padding: 20px 0;
}

canvas {
    background: #000;
    display: block;
    margin: 0 auto;
    border-radius: 8px;
    border: 1px solid #333;
}