body {
    margin: 0;
    background-color: #87CEEB; /* 天蓝色背景 */
    font-family: Arial, sans-serif;
}

#canvas {
    display: block;
    margin: 20px auto;
    border: 2px solid #333;
    background-color: #fff;
}

#score {
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin-top: 10px;
}