html,
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  height: 100%;
  background: black;
}

canvas {
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
}

#mode-toggle {
  display: none; /* hidden by default */
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  background: white;
  border: 2px solid black;
  border-radius: 50%;
  cursor: pointer;
  z-index: 100;
}

/* Show only on mobile devices */
@media (hover: none) and (pointer: coarse) {
  #mode-toggle {
      display: block;
  }
}