Start with a Row and some children

import 'package:flutter_web/material.dart';
import 'package:flutter_web_test/flutter_web_test.dart';
import 'package:flutter_web_ui/ui.dart' as ui;

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
      ],
    );
  }
}

// A widget that appears as a blue square. Just ignore the details for now!
class BlueBox extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      width: 50,
      height: 50,
      decoration: BoxDecoration(
        color: Colors.blue,
        border: Border.all(),
      ),
    );
  }
}