body {
  font-family: Arial, sans-serif;
  background: #2c2c2c;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
}
canvas {
  border: 2px solid #444;
  border-radius: 12px;
  background: #f0f0f0;
  margin-bottom: 15px;
}
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  max-width: 650px;
}
button {
  background: #444;
  border: none;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  color: white;
  font-weight: bold;
  transition: 0.2s;
}
button:hover {
  background: #666;
}