body {
  margin: 0;
  background: #000;
  color: #0f0;
  font-family: monospace;
  overflow: hidden;
}
canvas {
  display: block;
}
#message {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2rem;
  color: #0f0;
  text-shadow: 0 0 10px #0f0;
  pointer-events: none;
}