body {
    font-family: Arial, sans-serif;
    background: #222;
    color: #fff;
    text-align: center;
    margin: 0;
    padding: 0;
}

#game-container {
    margin: 30px auto;
    width: 800px;
    background: #111;
    border: 2px solid #555;
    border-radius: 10px;
    box-shadow: 0 0 20px #000;
    padding: 10px 0 20px 0;
}

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