TextStyle

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'TextStyle'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: Text(title)),
        body: Center(
            child: Text(
          'Hello, world!',
          style: TextStyle(
            color: Colors.blue,
            fontSize: 18.0,
            height: 1.2,
            fontFamily: 'Courier',
            background: Paint()..color = Colors.yellow,
            decoration: TextDecoration.underline,
            decorationStyle: TextDecorationStyle.dashed,
          ),
        )));
  }
}