Positioned Widget

 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: "Hello",
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.brown,
      ),
      home: const FlutterApp(),
    );
  }
}

class FlutterApp extends StatefulWidget {
  const FlutterApp({super.key});

  @override
  State<FlutterApp> createState() {
    return FlutterState();
  }
}

class FlutterState extends State<FlutterApp> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      drawer: InkWell(
        onTap: () {
          Navigator.pop(context);
        },
        child: const Drawer(),
      ),
      appBar: AppBar(
        title: const Text(
          "Flutter Positioned_Widget",
          style: TextStyle(fontWeight: FontWeight.bold),
        ),
        centerTitle: true,
        backgroundColor: Colors.grey,
      ),
      body: Container(
        width: 300,
        height: double.infinity,
        /*height: 500,*/
        color: Colors.blueGrey,
        child: Stack(
          children: [
            Positioned(
              bottom: 41,
              right: 35,
              child: Container(
                width: 100,
                height: 100,
                color: Colors.amberAccent,
              ),
            ),
          ],
        ),
      ),
    );
  }
}