       private var titleFont: UIFont?
       private var messageFont: UIFont?
       private var isHapticFeedbackEnabled: Bool?
+      private var windowLevel: UIWindow.Level?
 
       public init() {
       }

                errorIcon: UIImage? = nil,
                titleFont: UIFont = Defaults.titleFont,
                messageFont: UIFont = Defaults.messageFont,
                isHapticFeedbackEnabled: Bool = Defaults.isHapticFeedbackEnabled) {
      self.errorColor = errorColor
      self.successColor = successColor
      self.infoColor = infoColor

      public static let titleFont: UIFont = .boldSystemFont(ofSize: 16)
      public static let messageFont: UIFont = .systemFont(ofSize: 14)
      public static let isHapticFeedbackEnabled = true
      public static let windowLevel = UIWindow.Level.normal
    }

    let errorColor: UIColor
