         
         UIView.animateWithDuration(defaultPushPopDuration,
             animations: { () -> Void in
-                backOverlayView.alpha = 0.5
+                backOverlayView.alpha = 1.0
                 fromView.transform = CGAffineTransformMakeTranslation(-maxOffset, 0)
                 self.frontContainerView.transform = CGAffineTransformIdentity
                 self.frontContainerView.dropShadowView.alpha = 1.0

    
    private let backOverlayView: UIView = {
        let backOverlayView = UIView(frame: CGRectZero)
        backOverlayView.backgroundColor = UIColor(white: 0.0, alpha: 0.16)
        backOverlayView.alpha = 1.0
        return backOverlayView
        }()

    
    private let dropShadowView: UIView = {
        
        let w: CGFloat = 10.0
        
        let stretchableShadow = UIImageView(frame: CGRectMake(0, 0, w, 1))
        stretchableShadow.backgroundColor = UIColor.clearColor()
