.mask-index-alert{
    width: 100%;
    height: 100%;
    position: fixed;
    left: 0;
    top: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
}
.alert_index{
    width: 380px;
    height: 480px;
    position: fixed;
    left: 50%;
    margin-left: -190px;
    top: 50%;
    margin-top: -240px;
    z-index: 9999;
}
.close_alert_index{
    display: block;
    position: absolute;
    right:-40px;
    top: -40px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: url(/uploads/image/scimages/active_close.png) no-repeat center center;
}