#customPopup{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgba(0,0,0,.5);z-index:9999}#popupContent{background-color:#fff;width:50%;max-width:600px;margin:100px auto;padding:20px;border-radius:5px;box-shadow:0 0 10px rgba(0,0,0,.3)}