                 self.layout = value
             case .animation(let value):
                 self.animation = value
-            case .overlayColor(let value):
-                self.overlayColor = value
             case .overlayLayer(let value):
                 self.overlayLayer = value
             case .popupHeight(let value):

        self.baseScrollView.delegate = self
        self.baseScrollView.frame = self.view.frame
        self.baseScrollView.backgroundColor = .clear
        if let overlayLayer = self.overlayLayer {
            overlayLayer.frame = self.baseScrollView.bounds
            self.view.layer.insertSublayer(overlayLayer, at: 0)
        } else {
            self.view.backgroundColor = self.overlayColor
        }
        self.view.addSubview(self.baseScrollView)
        self.baseScrollView.addSubview(self.popupCollectionView)
    }

    // Custom Property
    fileprivate var layout: PopupLayout = .center
    fileprivate var animation: PopupAnimation = .slideUp
    fileprivate lazy var overlayLayer: CALayer = {
        let layer = CALayer()
        layer.backgroundColor = UIColor(white: 0.0, alpha: 0.4).cgColor
        return layer
    }()
    fileprivate var popupHeight: CGFloat = 400
    fileprivate var cellWidth: CGFloat = 300
    fileprivate var contentEdgeInsets: CGFloat = 24
