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