#overlay {
  display:none; 
  justify-content: center; 
  position:fixed; 
  top:0; 
  left:0; 
  height:100vh; 
  width:100vw; 
  background-color:rgba(255,255,255,0.5); 
  z-index:100; 
}
#loader { 
  margin-top:40vh; 
  text-align:center; 
  color:black; 
  z-index:1003;}