body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  margin: 0;
  background-color: #222;
  color: #fff;
  font-family: 'Segoe UI', sans-serif;
}

h1 {
  margin-bottom: 10px;
}

canvas {
  border: 2px solid #00ff99;
  background-color: #111;
}

.score {
  margin: 10px 0;
  font-size: 20px;
}

#restartBtn {
  background-color: #00ff99;
  color: #111;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  transition: 0.3s;
}

#restartBtn:hover {
  background-color: #00cc77;
}