html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: #111;
    font-family: Arial, Helvetica, sans-serif;
}

#game-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    border: 2px solid #333;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
}