     let ButtonFontSize: CGFloat = 17
     var animator: UIDynamicAnimator?
     var presentedAnimation: Bool = true
-    var keyboardHeight: CGFloat = 0
     
     var message: String?
     

            buttonViewHeightConstraint.constant = buttonView.contentSize.height
        }
        
        let backgroundViewHeight = view.bounds.size.height - keyboardHeight
        if buttonViewHeightConstraint.constant > backgroundViewHeight {
            buttonView.contentSize.height = buttonViewHeightConstraint.constant
            buttonViewHeightConstraint.constant = backgroundViewHeight

    public override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        layoutContainer()
        layoutContents()
        layoutButtons()
