input {
      border: 2px solid #ccc;
      border-radius: 6px;
      padding: 5px 10px;
      width: 100px;
      font-size: 16px;
      text-align: center;
    }

    button {
      background-color: #38a169;
      color: white;
      border: none;
      padding: 10px 20px;
      border-radius: 8px;
      font-size: 16px;
      cursor: pointer;
    }

    button:hover {
      background-color: #2f855a;
    }

    .result {
      font-weight: bold;
      font-size: 18px;
      margin-top: 15px;
    }

    .correct {
      color: green;
    }

    .wrong {
      color: red;
    }