body {
    font-family: Arial, sans-serif;
}

.tab-container {
    width: 80%;
    margin: 20px auto;
    border: 1px solid #ccc;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.tabs {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}

.tab-link {
    background-color: #f1f1f1;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 10px 20px;
    font-size: 16px;
}

.tab-link:hover {
    background-color: #ddd;
}

.tab-link.active {
    background-color: #ccc;
}

.tab-content {
    padding: 20px;
    border-top: 1px solid #ccc;
}

.overlay {
        display: none; /* 默认不显示 */
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0,0,0,0.5);
        color: white;
        font-size: 20px;
        text-align: center;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        display: flex;
    }