why this is not working in sliver app bar

[ABINASH56]

import 'package:flutter/material.dart';
import 'package:css_text/css_text.dart';

void main() {
runApp(MaterialApp(
title: 'Androidmonks',
home: Scaffold(
body: CustomScrollView(
slivers: [
SliverAppBar(

          backgroundColor: Colors.orangeAccent,
          floating: true,
          actions: <Widget>[
            _Home(),
          ],
        ),
      ],
    ),
  )));

}

class _Home extends StatelessWidget {
@OverRide
Widget build(BuildContext context) {
String htmlContent = """

Hello World!!
How are you today?
But why are you doing this?

Can you tell me?
Please visit Flutter docs

This text is slightly transparent, and has a slightly transparent background too.

""";

var myRichText =
    HTML.toRichText(context, htmlContent, linksCallback: (link) {
  print("You clicked on $link");
});

return Scaffold(
    body: Container(padding: EdgeInsets.all(16.0), child: myRichText));

}
}