custom shape

import 'dart:math';
import 'package:flutter/services.dart';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'සැණින්',
      theme: ThemeData(
//        backgroundColor: Colors.red,
        hoverColor: Colors.red[400],
        primaryColor: Colors.red,
      ),
      home: SafeArea(
        child: Scaffold(
          backgroundColor: Colors.grey[300],
          appBar: AppBar(
            elevation: 0.0,
            title: Text('සැණින්'),
            centerTitle: true,
            backgroundColor: Colors.red,
            actions: <Widget>[
              Transform.rotate(
                angle: pi / 4,
                child: IconButton(
                    icon: Icon(
                      Icons.notifications_active,
                      size: 30.0,
                    ),
                    onPressed: () {}),
              ),
              IconButton(icon: Icon(Icons.more_vert), onPressed: () {}),
            ],
//            bottom: PreferredSize(
//                child: Container(
//                  color: Colors.green[200],
//                ),
//                preferredSize: Size.fromHeight(75.0)),
          ),
            body: Container(
              height: 200.0,
              color: Colors.green,
              child: Stack(
                alignment: Alignment.topCenter,
                children: <Widget>[
                  Container(
                    height: 80.0,
                    color: Colors.red[400],
                  ),
                  Padding(
                    padding: const EdgeInsets.all(15.0),
                    child: Container(
                      height: 170.0,
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(12.0),
                        color: Colors.white,
                      ),

                    ),

                  ),
                  Positioned(
                      top: 30.0,
                      left: 15.0,
//                      width: 50.0,
//                      height: 20.0,
//                      child: Container(
//                    decoration: BoxDecoration(
//                      color: Colors.pink,
//                      shape: BoxShape.rectangle
//                    ),
//                        child: Padding(
//                          padding: const EdgeInsets.symmetric(vertical: 4.0,horizontal: 8.0),
//                          child: Text('අලුත්ම පුවත',style: TextStyle(color: Colors.white, fontSize: 10.0,fontWeight: FontWeight.bold)),
//                        ),
//                  ),
                  child: Card(
                    color: Colors.blue,
                    shape:  ,
                    child:Padding(
                          padding: const EdgeInsets.symmetric(vertical: 4.0,horizontal: 8.0),
                          child: Text('අලුත්ම පුවත',style: TextStyle(color: Colors.white, fontSize: 10.0,fontWeight: FontWeight.bold)),
                        ) ,

                  ),
                  ),
                ],
              ),
            ),
      ),
      ),
    );
  }
}