#overlay_a {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.8);
  z-index: 2;
  cursor: pointer;
}

#overlay_b {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.8);
  z-index: 2;
  cursor: pointer;
}

#overlay_c {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.8);
  z-index: 2;
  cursor: pointer;
}

#overlay_d {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.8);
  z-index: 2;
  cursor: pointer;
}



#overlay_close{
  position: absolute;
  top: 5%;
  right: 5%;
  font-size: 38px;
  color: white;

}

#overlay_close_invert{
  position: absolute;
  top: 5%;
  right: 5%;
  font-size: 38px;
  color: black;

}