body {
    font-family: sans-serif;
    text-align: center;
    background: #111;
    color: white;
  }
  
  h1 {
    margin: 20px 0 10px;
  }
  
  #score {
    margin-bottom: 10px;
    font-size: 1.2rem;
  }
  
  #game-board {
    width: 400px;
    height: 400px;
    background: #222;
    display: grid;
    grid-template-columns: repeat(20, 1fr);
    grid-template-rows: repeat(20, 1fr);
    margin: 0 auto 20px;
    border: 2px solid #444;
  }
  
  .cell {
    width: 100%;
    height: 100%;
  }
  
  .snake {
    background-color: limegreen;
  }
  
  .food {
    background-color: red;
  }
  
  button {
    padding: 10px 20px;
    font-size: 1rem;
    cursor: pointer;
  }