         backgroundView.frame = self.view.frame        
     }
     
-    public func startSnowing() {
+    func startSnowing() {
         emitter = CAEmitterLayer()
         
         emitter.emitterPosition = CGPoint(x: view.frame.size.width / 2.0, y: 0)

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        startSnowing()
    }


        view.layer.addSublayer(emitter)
    }
    
    func stopSnowing() {
        emitter?.birthRate = 0
    }
    
