canvas {
  display: block;
  margin: 0 auto
}

#orientation_warning {
  z-index: 10;
  min-width: 100vw;
  min-height: 100vh;
  text-align: center;
  font-size: 24px;
  display:flex;
  align-items:center;
  justify-content: center;
  height:100vh;
  width:100vw;
}