import 'package:flutter/material.dart';

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

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Expanded(
                  child: FittedBox(
                fit: BoxFit.fitWidth,
                alignment: Alignment.center,
                child: Container(
                    color: Colors.blueGrey,
                    width: 2,
                    height: 2,
                    child: Stack(
                      alignment: Alignment.center,
                      children: [
                        Icon(Icons.close, size: 1.0, color: Colors.red),
                        Container(
                          width: 0.2,
                          height: 0.2,
                          color: Colors.yellow,
                        ),
                      ],
                    )),
              ))
            ],
          ),
        ),
      ),
    );
  }
}