wkwebview not scrolling on evaluatejavacript with custom CSS - objective-c

Question

I am trying to load html page on a web view and i am having issue with scrolling the page.I tried to add javascript with overflow changed to scroll and no luck.What am i missing here?
-(WKWebView*) getWebViewForUrl:(NSString*)relativeUrl {
WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 2, self.bounds.size.width-10, HEIGHT_WEBVIEW)];
webView.scrollView.scrollEnabled = TRUE;
webView.contentMode = UIViewContentModeScaleAspectFit;
webView.scrollView.bounces = NO;
webView.navigationDelegate = self;
NSString* endpoint = [NSUserDefaultsManager getObjectFromUserDeafults:PORTAL_ENDPOINT];
// NSString* url = [NSString stringWithFormat:#"%#/%#",endpoint,defect.html_description_source];
//NSString* url = #"http://www.yahoo.com";
NSString *url = [NSString stringWithFormat:#"%#%#.html?auth_token=%#&device_id=%#", endpoint, relativeUrl, [[NSUserDefaults standardUserDefaults] objectForKey:#"accessToken"], [DeviceManager getDeviceID]];
NSLog(#"the html %#",url);
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];
return webView;
}
- (void)webViewDidFinishLoad:(WKWebView *)webView {
NSString *jsString = #"document.querySelectorAll('*[style]').forEach(el => el.style.overflow = 'scroll');";
[webView evaluateJavaScript:jsString completionHandler:nil];
[self hideLoadingScreen];
}