body {
  margin: 0;
  background-color: #111;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

html {
  touch-action: manipulation;
}

canvas {
  background: radial-gradient(circle at center, #333 0%, #222 100%);
  border: 4px solid #444;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
  border-radius: 12px;
}

canvas {
  touch-action: manipulation;
}