body {
  background-color: #111;
  color: white;
  font-family: 'Segoe UI', sans-serif;
  text-align: center;
  margin: 0;
  padding: 20px;
}

canvas {
  background-color: #222;
  display: block;
  margin: 20px auto;
  border: 2px solid lime;
  border-radius: 10px;
}

#start-screen {
  margin: 40px auto;
}

#start-screen button {
  margin: 10px;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  background-color: limegreen;
  color: white;
  transition: 0.3s;
}

#start-screen button:hover {
  background-color: green;
}

.controls button {
  padding: 8px 15px;
  font-size: 16px;
  margin: 5px;
  border-radius: 6px;
  border: none;
  background-color: #444;
  color: white;
  cursor: pointer;
  transition: 0.3s;
}

.controls button:hover {
  background-color: #666;
}