#overlay{
  display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;

}
#popup{
   max-width: 600px;
   height: 300px;
   margin: auto;
   background-color: white;
   position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
   
}