     public func stopSnowing() {
         emitter?.birthRate = 0
     }
-    
     
     func snowFlakeWith(color: UIColor) -> CAEmitterCell {
         

    }

    override func viewWillLayoutSubviews() {

        backgroundView.frame = self.view.frame
        
    }
    
    public func startSnowing() {

        backgroundView.image = #imageLiteral(resourceName: "background")
        backgroundView.contentMode = .scaleAspectFill
        view.addSubview(backgroundView)
    }
    
    override func viewDidAppear(_ animated: Bool) {
