body {
  background: #0d1117;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  color: white;
  font-family: sans-serif;
}

canvas {
  background: #111;
  border: 1px solid #333;
}

button {
  margin-top: 20px;
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-weight: bold;
}