Fix height of keyboard

lib/src/webview_scaffold.dart

@@ -92,6 +92,7 @@ class _WebviewScaffoldState extends State<WebviewScaffold> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: widget.appBar,
+      resizeToAvoidBottomPadding: false,
       persistentFooterButtons: widget.persistentFooterButtons,
       bottomNavigationBar: widget.bottomNavigationBar,
       body: _WebviewPlaceholder(