.container {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 20px;
        border-radius: 20px;
        margin: 20px auto;
        max-width: 500px; /* 设置最大宽度 */
        background-image: linear-gradient(0deg, #fbfbfb, #ffffff);
        border: 2px solid #ffffff;
        box-shadow: 0 0px 8px rgb(0 0 0 / 10%);
        text-align: center;
    }

    .book-cover {
        width: 400px;
        height: 515px;
        background-image: url("https://cdn.8i5.net/2024/10/The-Book-of-Answers.png");
        background-size: cover;
        cursor: pointer;
        border-radius: 10px;
    }

    #answerModal {
        display: none; /* 默认隐藏弹窗 */
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: white;
        border: 2px solid #ddd;
        border-radius: 10px;
        padding: 20px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        z-index: 1000;
        text-align: center;
    }

    #modalOverlay {
        display: none; /* 默认隐藏覆盖层 */
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    #instructions {
        margin-top: 20px;
        font-size: 16px;
        color: #555;
        text-align: center;
    }

    h1 {
        color: #4CAF50;
    }

    #instructions strong {
        color: #ff5722;
    }

    #instructions {
        font-style: italic;
        margin-bottom: 20px;
    }