#img_alert {
    width: 100%;
    height: 100%;
    display: none;
    position: absolute;
    top: 0px;
    left: 0px;
    background-color: rgba(0, 0, 0, 0.42);
}

#img_alert .img_content {
    width: 504px;
    height: auto;
    position: relative;
    left: 50%;
    margin-left: -200px;
    opacity: 0;
    top: 50%;
    border: 2px solid #ffffff;
}

#img_alert .img_content .closed {
    width: 25px;
    height: 25px;
    background-color: #636363;
    display: inline-block;
    position: absolute;
    top: -13px;
    right: -10px;
    text-align: center;
    border-radius: 100%;
    color: #fff;
    cursor: pointer;
}

#img_alert .img_content img {
    width: 500px;
    display: inherit;
    height: auto;
}
.qrcode-number{display:block;height:280px;text-align:center;vertical-align: middle}