stackoverflow_question_solution_74152502

main.dart

import 'dart:math';

import 'package:flutter/material.dart';

void main() {
  runApp(const MainApp());
}

class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: SafeArea(
          child: CustomScrollView(
            slivers: <Widget>[
              const SliverToBoxAdapter(
                child: Align(
                  alignment: Alignment.centerLeft,
                  child: Padding(
                    padding: EdgeInsets.all(16.0),
                    child: SizedBox(height: 16.0, child: Text("Some Title")),
                  ),
                ),
              ),
              SliverGrid.builder(
                gridDelegate: const SliverGridDelegateWithMaxCrossAxisExtent(
                  maxCrossAxisExtent: 120,
                ),
                itemBuilder: (context, index) {
                  return Container(
                    color: _randomColor(),
                  );
                },
                itemCount: 100,
              ),
            ],
          ),
        ),
      ),
    );
  }

  Color _randomColor() {
    final index = Random().nextInt(Colors.primaries.length);
    return Colors.primaries[index];
  }
}