body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #333;
    color: white;
    font-family: Arial, sans-serif;
  }
  
  #game-board {
    text-align: center;
  }
  
  #tetris {
    border: 2px solid white;
    background-color: #222;
  }
  
  #start-button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
  }
  
  #start-button:hover {
    background-color: #45a049;
  }