html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #111;
}

body {
  position: relative;
}

#canvas,
#video {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
}

#canvas {
  z-index: 1;
}

#video {
  z-index: 0;
  opacity: 0;
  pointer-events: none;
}

#coords {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 2;
  margin: 0;
  color: #b9ffb0;
  font: 16px/1.35 monospace;
  white-space: pre-wrap;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}