How to place container in bottom of the screen in Flutter?

import 'package:flutter/material.dart';

void main(List<String> args) {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @
override

  Widget build(BuildContext context) {
    return Align(
      alignment: FractionalOffset.bottomCenter,
      child: Container(
        height: 100,
        width: 100,
        decoration: const BoxDecoration(
          color: Colors.amber,
        ),
      ),
    );
  }
}