body {
  background: #222;
  color: #eee;
  font-family: Arial, sans-serif;
  text-align: center;
}

canvas {
  background: #000;
  border: 2px solid #eee;
  display: block;
  margin: 20px auto;
}

#score {
  font-size: 18px;
}

.hidden {
  display: none;
}

#game-over {
  font-size: 24px;
  color: red;
  margin-top: 10px;
}