column_stretch.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(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(title: Text("Column tips")),
        body: Column(children:[
          MyColumn(),
          SizedBox(height: 16),
          MyColumnStretch()
        ])  
      ),
    );
  }
}


class MyColumnStretch extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: <Widget>[
          Text("Com strech"),
          ElevatedButton(
            onPressed: () {
            },
            child: Text('Button Um'),
          )
        ],
      ),
    );
  }
}

class MyColumn extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(16.0),
      child: Column(
        children: <Widget>[
          Text("Sem strech"),
          ElevatedButton(
            onPressed: () {
            },
            child: Text('Button Um'),
          )
        ],
      ),
    );
  }
}