body {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
      margin: 0;
      background-color: #333;
      font-family: 'Arial', sans-serif;
    }

    #card {
      padding: 20px;
      border: 1px solid #ccc;
      width: 350px;
      border-radius: 8px;
      background-color: gainsboro;
      box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
      text-align: center;
      transition: transform 0.3s ease-in-out;
    }

    #inputGuess {
      margin-top: 10px;
      padding: 8px;
      font-size: 16px;
    }

    #feedback {
      margin-top: 10px;
      font-weight: bold;
    }

    .correct {
      color: green;
    }

    #nextButton {
      margin-top: 15px;
      padding: 10px 20px;
      font-size: 16px;
      cursor: pointer;
      background-color: #4caf50;
      color: #fff;
      border: none;
      border-radius: 4px;
      display: none;
    }

    .modal {
      display: none;
      position: fixed;
      z-index: 1;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      overflow: auto;
      background-color: rgba(0, 0, 0, 0.4);
    }

    .modal-content {
      background-color: #fefefe;
      margin: 15% auto;
      padding: 20px;
      border: 1px solid #888;
      width: 300px;
      text-align: center;
    }

    .modal-button {
      background-color: #4CAF50;
      border: none;
      color: white;
      padding: 10px 20px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 16px;
      margin: 20px 2px;
      cursor: pointer;
    }

    @media only screen and (max-width: 600px) {
      #card {
        width: 280px; /* Ajustar el ancho para dispositivos móviles */
      }
    }

    @media only screen and (max-width: 400px) {
      #card {
        width: 250px; /* Ajustar el ancho para dispositivos móviles más pequeños */
      }
    }