Container for a text with special background color for the first words

rich_text_container.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: Container(
            padding: EdgeInsets.all(20),
            color: Colors.cyan,
            width: 400,
            child: RichText(
              text: TextSpan(
                style: TextStyle(
                  fontSize: 26,
                ),
                children: [
                  TextSpan(
                    text: "Banner ",
                    style: TextStyle(backgroundColor: Colors.red),
                  ),
                  TextSpan(text: "This is a news header, "),
                  TextSpan(text: "This is a news header"),
                  TextSpan(text: "This is a news header"),
                  TextSpan(text: "This is a news header"),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}