/*弹窗*/
div {
    padding: 0;
    margin: 0;
}

.cover {
    background: rgba(0, 0, 0, 0.64);
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 101;
}

.pop_box {
    width: 74%;
    margin: 0 auto;
    position: fixed;
    top: 30%;
    left: 50%;
    margin-left: -37%;
    z-index: 102;
}

.pop_center span {
    text-align: center;
    font-size: 18px;
    color: #fff;
    line-height: 30px;
    margin-left: 28%;
}