html,
body {
  padding: 0px;
  margin: 0px;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

dialog {
  text-align: center;
}

canvas.fullscreen {
  width: 100vw;
  height: 100vh;
}

#xrButton {
  position: absolute;
  color: whitesmoke;
  left: 0%;
  bottom: 0%;
  font-size: 50px;
  background-image: linear-gradient(144deg, #AF40FF, #5B42F3 50%, #00DDEB);
  border-radius: 8px;
}

#ui {
  position: absolute;
  top: 0;
  right: 0;
}