html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  margin: 0;
  padding: 0;
  background: #231F20;

  display: flex;
  justify-content: center;
  align-items: center;
}

#tuanjie-canvas {
  width: 100%;
  height: 100%;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

body.mobile {
  text-align: left;
}

body.mobile #tuanjie-canvas {
  position: fixed;
}