main.dart

import 'package:flutter/material.dart';

main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: CircleAvatar(
            radius: 120,
            backgroundImage: NetworkImage('https://source.unsplash.com/collection/4141224')
         ),
        ),
      ),
    );
  }
}