#mannual-panel {
    position: absolute;
    width: 500px;
    height: 400px;
    background-color: black;
    border-radius: 10px;
}

#keyboard {
    position: absolute;
    width: 400px;
    height: 200px;
    right: 57px;
    top: 20px;
    margin-top: 20px;
    display: flex;
    /* 使用 Flexbox 布局 */
    flex-direction: column;
    justify-content: center;
    flex-wrap: wrap;
    /* 允许子元素换行 */
}

#keyboard .button {
    display: inline-block;
    font-size: 30px;
    width: 60px;
    height: 60px;
    background-color: transparent;
    border: 5px solid green;
    color: green;
    border-radius: 2px;
    margin-bottom: 5px;
    pointer-events: none;
}

#keyboard .button.active {
    background-color: green;
    color: white;
}

#mannual {
    position: absolute;
    width: 400px;
    height: 300px;
    right: 50px;
    top: 250px;
}

#mannual h {
    font-size: 30px;
    color: green;
    margin-bottom: 10px;
}