         }
     }
 
-    @objc private func closeWebView(_ sender: Any) {
+    @objc private func closeWebView() {
         let alert = UIAlertController(title: Define.String.quitPayment, message: nil, preferredStyle: .alert)
         let cancel = UIAlertAction(title: Define.String.cancel, style: .cancel, handler: nil)
         let ok = UIAlertAction(title: Define.String.okay, style: .default, handler: { _ in

        super.viewDidLoad()
        setupWebView()
        setupIndicator()
    }

    override func viewDidLayoutSubviews() {

        webView.contentMode = .scaleToFill
        webView.autoresizingMask = .flexibleWidth
        view.addSubview(webView)
        webView.loadHTMLString(atoneHTML, baseURL: nil)
        webView.navigationDelegate = self
        webView.uiDelegate = self
