.popup {
    position: fixed;
    top: 50%;
    left: 10%;
    transform: translate(-50%, -50%);
 
    text-align: center;
    z-index:9999;
}

.popup-content h2 {
    margin-bottom: 10px;
    color: #333;
}

.close-btn {
    position: absolute;
    right: 2px;
    top: 2px;
    width: 20px;
    height: 20px;
    background: #0167AE;
    border-radius: 50%;
    color: white;
    text-align: center;
    line-height: 20px;
    cursor: pointer;
    font-size: 14px;
}

    .close-btn:hover {
        color: #000;
    }


    @media (max-width: 768px) {
        /* 手机端样式调解 */
        .popup {
            /* 调解弹窗在手机端的位置 */
            left: 50%; 
            width: 80%; 
        }
        .close-btn {
            /* 调解关闭按钮在手机端的巨细和位置 */
            width: 25px;
            height: 25px;
            line-height: 25px;
            font-size: 16px;
        }
    }
<!--耗时1758101446.4497秒-->