List with spaced items

 import "package:flutter/material.dart";

void main()
{
  runApp(const MyApp());
}
class MyApp extends StatelessWidget
{
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "List with spaced items",
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.grey,
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.grey),
        cardTheme: const CardTheme(color: Colors.grey),
        useMaterial3: true,
      ),
      home: ListWithSpacedItems(),
    );
  }
}
class ListWithSpacedItems extends StatelessWidget
{
  ListWithSpacedItems({super.key});
  var items = 20;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text("List with spaced items", style: TextStyle(fontWeight: FontWeight.bold),),
        centerTitle: true,
        backgroundColor: Colors.grey,
      ),
      body: LayoutBuilder(
        builder: (context, constraints) {
          return SingleChildScrollView(
            child: ConstrainedBox(
              constraints: BoxConstraints(minHeight: constraints.maxHeight),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: List.generate(items, (index) {
                  return ItemWidget(text: "Item $index");
                },),
              ),
            ),
          );
        },
      ),
    );
  }
}
class ItemWidget extends StatelessWidget
{
  const ItemWidget({super.key, required this.text});
  final String text;

  @override
  Widget build(BuildContext context) {
    return Card(
      child: SizedBox(
        height: 100.0,
        child: Center(child: Text(text,
          style: const TextStyle(color: Colors.white, fontSize: 30.0),),),
      ),
    );
  }
}