body {
    font-family: sans-serif;
  }

  #chess-square {
    font-weight: bold;
  }

  #user-response {
    border: 1px solid #ccc;
    padding: 5px;
  }

  #check-answer {
    background-color: #4caf50;
    border: none;
    color: white;
    padding: 10px 20px;
    cursor: pointer;
  }

  #check-answer:hover {
    background-color: #3e8e41;
  }