Rounded button ... suitable for login button on home page

gistfile1.txt

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Title',
      home: LoginButt(),

    );
  }


  }

  class LoginButt extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return Container(
      width: MediaQuery.of(context).size.width,
      margin: const EdgeInsets.only(left: 30.0, right: 30.0, top: 150.0),
      alignment: Alignment.center,
      child: Row(
        children: <Widget>[
         Expanded(
           child: OutlineButton(
             color: Colors.red,
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(30.0)
              ),
              onPressed: null),
         ),
      ]),
    );

  }