How to create Rounded button in flutter

Using StadiumBorder

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Button'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {},
          child: const Text(
            'Elevated Button',
            style: TextStyle(
              fontSize: 20,
            ),
          ),
          style: ElevatedButton.styleFrom(
            shape: StadiumBorder(),
          ),
        ),
      ),
    );
  }
}

Using RoundedRectangleBorder

ElevatedButton(
          onPressed: () {},
          child: const Text(
            'Elevated Button',
            style: TextStyle(
              fontSize: 20,
            ),
          ),
          style: ElevatedButton.styleFrom(
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(20),
            ),
          ),
        ),

Using CircleBorder

ElevatedButton(
          onPressed: () {},
          child: const Text(
            'Elevated Button',
            style: TextStyle(
              fontSize: 20,
            ),
          ),
          style: ElevatedButton.styleFrom(
            shape: CircleBorder(),
            padding: EdgeInsets.all(70),
          ),
        ),

Using BeveledRectangleBorder

ElevatedButton(
          onPressed: () {},
          child: const Text(
            'Elevated Button',
            style: TextStyle(
              fontSize: 20,
            ),
          ),
          style: ElevatedButton.styleFrom(
            shape: BeveledRectangleBorder(
              borderRadius: BorderRadius.circular(12),
            ),
          ),
        ),