.pop_bg {
    background: rgba(0,0,0,0.5);
    position: fixed;
    width:100%;
    max-width: 750px;
    height: 100%;
    top: 0;
    bottom: 0;
    right: 0;
    z-index: 99;
    display: none;
    margin:0 auto;
}
.pop_bg .pop_text {
    /* display: none; */
    background: rgba(0,0,0,0.6);
    border-radius: 5px;
    background-size: cover;
    position: absolute;
    z-index: 1;
    top: 20%;
    left: 50%;
    line-height: 35px;
    padding: 10px 10px;
    width: 240px;
    color: #fff;
    /*width: 240px;*/
    margin-left: -120px;
    text-align: center;
    font-size: 16px;
}