body {
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

canvas {
  background: #111;
  image-rendering: pixelated;
  border: 2px solid #333;
  box-shadow: 0 0 20px #0f0;
  border-radius: 10px;
}