content: import 'package:flutter/material.dart';
  
  void main() {
    runApp(MaterialApp(
      title: "Stack Example",
      home: Scaffold(
        appBar: AppBar(title: Text("Stack Example")),
        body: MyApp(),
      ),
    ));
  }
  
  class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Center(
        child: Stack(
          //mainAxisAlignment: MainAxisAlignment.center,
          //alignment: Alignment.bottomCenter,
          overflow: Overflow.visible,
          children: [
            Container(
              width: 200,
              height: 200,
              color: Colors.red,
            ),
            Positioned(
              top: 0,
              left: 0,
              height: 120,
              width: 120,
              child: Container(
                width: 100,
                height: 100,
                color: Colors.blue,
              ),
            ),
            Positioned(
              bottom: -25,
              right: 10,
              child: Container(
                width: 50,
                height: 50,
                color: Colors.green,
              ),
            )
          ],
        ),
      );
    }
  }
  