How can I layout GridView.count so the widgets start building from the top of the parent widget in Flutter?

Question

When I build a GridView.count - it centers the children widgets, how do I get them to start building from the very center top of their parent in Flutter?

I can't find the appropriate property to do this. I tried wrapping the Gridview.count in an Align widget aligning to topCenter and that didnt work either.

(example pic attached).

Thank you!

                  Expanded(
                    flex: 2,
                    child: Container(
                      color: Colors.greenAccent,
                      child: Align(
                        alignment: Alignment.topCenter,
                        child: GridView.count(
                          childAspectRatio: 1.5,
                          crossAxisCount: 2,
                          mainAxisSpacing: 10,
                          crossAxisSpacing: 10,
                          children: [
                            Container(
                              color: Colors.grey,
                            ),
                            Container(
                              color: Colors.blue,
                            ),
                            Container(
                              color: Colors.orange,
                            ),
                            Container(
                              color: Colors.purple,
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),

Answer 1

Just to point that its not about widget you posted:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Material App Bar'),
        ),
        body: Column(
          children: [
            Container(
              width: double.infinity,
              height: 140,
              color: Colors.black,
            ),
            Expanded(
              flex: 2,
              child: Container(
                color: Colors.greenAccent,
                child: Align(
                  alignment: Alignment.topCenter,
                  child: GridView.count(
                    childAspectRatio: 1.5,
                    crossAxisCount: 2,
                    mainAxisSpacing: 10,
                    crossAxisSpacing: 10,
                    children: [
                      Container(
                        color: Colors.grey,
                      ),
                      Container(
                        color: Colors.blue,
                      ),
                      Container(
                        color: Colors.orange,
                      ),
                      Container(
                        color: Colors.purple,
                      ),
                    ],
                  ),
                ),
              ),
            ),
            Spacer(),
          ],
        ),
      ),
    );
  }
}