TF-295 Remove duplication vertical scrollbar in EmailDetailView

core/lib/presentation/views/html_viewer/html_content_viewer_on_web_widget.dart

@@ -125,7 +125,7 @@ class _HtmlContentViewerOnWebState extends State<HtmlContentViewerOnWeb> {
       ..height = actualHeight.toString()
       ..srcdoc = _htmlData ?? ''
       ..style.border = 'none'
-      ..style.overflowY = 'hidden'
+      ..style.overflow = 'hidden'
       ..onLoad.listen((event) async {
         var data = <String, Object>{'type': 'toIframe: getHeight'};
         data['view'] = createdViewId;
@@ -173,6 +173,9 @@ class _HtmlContentViewerOnWebState extends State<HtmlContentViewerOnWeb> {
         });
       });
 
+    iframe.setAttribute('scrolling', 'no');
+    iframe.setAttribute('seamless', 'seamless');
+
     ui.platformViewRegistry.registerViewFactory(createdViewId, (int viewId) => iframe);
 
     if (mounted) {