         if currentXOffset == nil && currentYOffset == nil {
             view.addSubview(centerViewController.view)
             centerViewController.view.translatesAutoresizingMaskIntoConstraints = false
-            centerViewController.view.backgroundColor = UIColor.blue
             self.currentXOffset = alignCenterXConstraint(forItem: centerViewController.view, toItem: view, position: .center)
             self.currentYOffset = alignCenterYConstraint(forItem: centerViewController.view, toItem: view, position: .center)
             view.addConstraints([self.currentXOffset, self.currentYOffset])

        return true
    }
    
    @IBAction @objc fileprivate func onPanGestureTriggered(sender: UIPanGestureRecognizer) {
        switch sender.state {
        case .began:
            /* Restrict pan movement

        case .right:
            targetOffset = rightContainerOffset
        }
        return (currentXOffset.constant, currentYOffset.constant) == (targetOffset.dx, targetOffset.dy)
    }
    
    // MARK: - Pan Gestures
