/* See https://www.w3schools.com/howto/howto_css_overlay.asp 
-------------------------------------------------- */
#overlay {
  background-color: rgba(0,0,0,0.8); /* Black background with opacity */
  bottom: 0;
  color: #000000;
  cursor: pointer;
  display: block;
  height: 100%;
  left: 0;
  position: fixed;
  right: 0;
  top: 0;
  width: 100%;
  z-index: 2;
}

#text{
  position: absolute;
  top: 50%;
  left: 50%;
  font-size: 50px;
  color: white;
  text-align: center;
  transform: translate(-50%,-50%);
  -ms-transform: translate(-50%,-50%);
}

#x {
  margin-left: 10px; 
  margin-top: 10px; 
  margin-bottom: 10px; 
  font-weight: bold; 
  color: #005DAB;
}