body {
  text-align: center;
  font-family: Arial, sans-serif;
  background: #111;
  color: white;
}

canvas {
  background: #000;
  border: 2px solid #444;
  margin-top: 20px;
}

button {
  margin-top: 10px;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}