override func viewDidLoad() {
super.viewDidLoad()
let url = URL(string: "<http://www.campus-taxi.com/>")
let request = URLRequest(url: url!)
// self.webView?.allowsBackForwardNavigationGestures = true //뒤로가기 제스쳐 허용
...
webView.scrollView.bounces = false //<--상하 스크롤 제거