html {
  height: 100%;
}
body {
  height: 100%;
  margin: 0;
  background-color: #000;
}
canvas {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  z-index: -1;
}
button {
  width: 280px;
  height: 64px;
  color: white;
  position: absolute;
  left: 50%;
  transform: translate(-50%,0);
  font: 32px sans-serif;
  border: solid 2px white;
  border-radius: 8px;
  z-index: 11;
}
.greyButton {
  bottom: 3%;
  transform: translate(-50%,0) scale(0.8);
  background-color: darkgrey;
}
.greenButton {
  bottom: 50%;
  background-color: darkgreen;
}
.greyButton:hover {
  background-color: #888888;
  cursor: pointer;
}
.greenButton:hover {
  background-color: #089c00;
  cursor: pointer;
}
#vrButtonLabel {
  width: 100%;
  color: white;
  font: 2.2rem "Fira Sans", sans-serif;
  text-align: center;
  position: absolute;
  top: 60%;
  transform: translate(0,-50%);
  user-select: none;
}