flutter_canvas_template_editor/lib/test_page.dart

import 'package:flutter/material.dart';

class TestPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Hit Test'),
      ),
      body: Stack(
        clipBehavior: Clip.none,
        children: [
          GestureDetector(
            onTap: () {
              print('Red Container tapped');
            },
            child: Container(
              width: 100,
              height: 100,
              color: Colors.red,
              margin: EdgeInsets.all(20),
            ),
          ),
          GestureDetector(
            onTap: () {
              print('Blue Container tapped');
            },
            child: Container(
              width: 50,
              height: 50,
              color: Colors.blue,
              margin: EdgeInsets.fromLTRB(30, 20, 20, 20),
            ),
          ),
        ],
      ),
    );
  }
}