import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Home(),
    );
  }
}

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("AppBar"),
      ),
      body: Center(
        child: Text("Body"),
      ),
      backgroundColor: Colors.grey,
      floatingActionButton: FloatingActionButton(
        onPressed: () {},
        child: Icon(Icons.check),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
          bottomNavigationBar: BottomAppBar(
        shape: const CircularNotchedRectangle(),
        child: Container(
          height: 50.0,
        ),
      ),
    );

  }
}