.open-map-btn {
  margin-left: 10px;
  padding: 3px 8px;
  background: #ccc;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.open-map-btn:hover {
  background: #aaa;
}
#mapOverlay {
  display: none;
  position: fixed;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(0,0,0,0.75);
  z-index: 999999;
}
#mapOverlay iframe {
  width: 90vw;
  height: 90vh;
  border: none;
  margin: 5vh 5vw;
  border-radius: 8px;
  box-shadow: 0 0 25px rgba(0,0,0,0.6);
}
#mapOverlayClose {
  position: fixed;
  top: 12px;
  right: 20px;
  font-size: 32px;
  color: white;
  cursor: pointer;
  z-index: 1000000;
}
#mapOverlayClose:hover {
  color: #ffaaaa;
}