flutter-template-singlescroll column

main.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
//      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
            leading: IconButton(icon: Icon(Icons.arrow_back), onPressed: () {}
                // onPressed:() => Navigator.pop(context, false)
                ),
            title: Text("My app title")),
        body: SingleChildScrollView(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.center,
      children: <Widget>[
        Container(color: Color(0xffabcdef), height: 64),
        Text('Hello, Dartpad!', style: Theme.of(context).textTheme.headline4)
      ],
    );
  }
}