@media all and (max-width: 640px) {
  .lil-gui.root {
    right: auto;
    top: auto;
    max-height: 50%;
    max-width: 80%;
    bottom: 0;
    left: 0;
  }
}

#blocker {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: none;
}

#instructions {
  width: 100%;
  height: 100%;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  text-align: center;
  font-size: 1.2em;
  cursor: pointer;
}

#arrows {
  font-size: 2em;
}