How to hide elements in webview in Flutter.?

Question

I want to hide section of website in my flutter application. I added flutter flutter_webview_plugin in pubspec.yaml file and imported package to my feed.dart page. the flutterWebviewPlugin.evalJavascript("alert('Hi, I just executed')"); is executed when I run the application. But flutterWebviewPlugin.evalJavascript("document.getElementById('header04-2j').style.display = 'none';"); I tried to hide header but its not working. Below is the source code.

class FeedPage extends StatefulWidget {
  @override
  FeedPageState createState() {
    return new FeedPageState();
  }
}

class FeedPageState extends State<FeedPage> {
  final flutterWebviewPlugin = new FlutterWebviewPlugin();
  // alternatively you can define variable as var js = "YOUR_SCRIPT"; and use it inside evalJavascript

  @override
  void initState(){
    super.initState();
    flutterWebviewPlugin.evalJavascript("alert('Hi, I just executed')"); // executed
    flutterWebviewPlugin.evalJavascript("document.getElementById('header04-2j').style.display = 'none';"); // not executed
  }

  @override
  void dispose() {
    flutterWebviewPlugin.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return WebviewScaffold(
      url: 'https://www.esdatech.com/',
      hidden: true,
      appBar: AppBar(title: Text("ESDA")),
    );
  }
}