* {
  box-sizing: border-box;
}

html,
body,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: #111;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

#loading {
  position: fixed;
  inset: 50% auto auto 50%;
  color: #fff;
  font: 14px/1.4 system-ui, sans-serif;
  transform: translate(-50%, -50%);
}