#popup {
  width:500px;
  display:none;
  position:absolute;
  margin:0 auto;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
}
#close{
  font-size:30px; 
  padding-left:40%;
  padding-top:1%; 
  margin:auto;
  position: absolute;
}
#popup h5{
  font-size:25px; 
  padding:20px;
  color:white;
}

@media (max-width:768px){
  #popup {
    width:350px;
  }
  #close{ 
    padding-left:40%;
  }
  }