body {
      margin: 0;
      height: 100vh;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: #f2f2f2;
      font-family: Arial, sans-serif;
    }

    .container {
      text-align: center;
    }

    #reader {
      width: 300px;
      margin: 0 auto 20px;
    }

    #camera-select {
      padding: 8px;
      font-size: 14px;
      margin-bottom: 10px;
    }

    #toggle-btn {
      background-color: #e53935;
      color: white;
      border: none;
      padding: 12px 24px;
      font-size: 16px;
      border-radius: 30px;
      cursor: pointer;
      transition: background-color 0.3s ease;
    }

    #toggle-btn:hover {
      background-color: #c62828;
    }

    #resultado {
      margin-top: 15px;
      font-weight: bold;
    }