body {
  background: #111;
  color: #fff;
  text-align: center;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

h1 {
  margin: 20px;
}

#gameBoard {
  width: 400px;
  height: 400px;
  background: #222;
  margin: 20px auto;
  display: grid;
  grid-template-rows: repeat(20, 20px);
  grid-template-columns: repeat(20, 20px);
  border: 3px solid #0ff;
  cursor: crosshair;
}

.snake {
  background: limegreen;
  border-radius: 4px;
}

.food {
  background: red;
  border-radius: 50%;
}

#score {
  font-size: 20px;
  margin-top: 10px;
}

#gameOver {
  display: none;
  font-size: 24px;
  color: #ff4444;
  margin-top: 15px;
}