* {
    margin: 0;
    padding: 0;
}

html,
body {
    overflow: hidden;
}

.webgl {
    position: fixed;
    top: 0;
    left: 0;
    outline: none;
}

body {
    margin: 0;
    overflow: hidden;
    background-color: #000;
}

canvas {
    display: block;
}

.serve-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 10px 20px;
    font-size: 16px;
    z-index: 1;
    cursor: pointer;
}

.marbles-btn {
    position: absolute;
    top: 20px;
    left: 120px;
    /* Positioned to the right of the serve button */
    padding: 10px 20px;
    font-size: 16px;
    z-index: 1;
    cursor: pointer;
}

.music-btn {
    position: absolute;
    top: 20px;
    /* 确保按钮并列显示 */
    left: 260px; 
    padding: 10px 20px;
    font-size: 16px;
    z-index: 1;
    cursor: pointer;
}