Expanded widget example in flutter

import 'package:flutter/material.dart';

void main(List<String> args) {
  runApp(const MyApp());
}

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

  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: MyWidget(),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  const MyWidget({
    super.key,
  });
  @
override

  Widget build(BuildContext context) {
    return Center(
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: const [
          MyContainer(clr: Colors.red),
          Expanded(child: MyContainer(clr: Colors.green)),
          MyContainer(clr: Colors.red),
        ],
      ),
    );
  }
}

class MyContainer extends StatelessWidget {
  const MyContainer({
    super.key,
    required this.clr,
  });
  final Color clr;
  @
override

  Widget build(BuildContext context) {
    return Container(
      height: 100,
      width: 100,
      color: clr,
    );
  }
}