A sample card

cardbeva.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Container(child: Center(child: B4eva())),
    );
  }
}

class B4eva extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      height: 150,
      width: 300,
      child: Stack(
        clipBehavior: Clip.none,
        children: [
          Card(
            child: Padding(
              padding: const EdgeInsets.all(14.0),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.end,
                children: [
                  RichText(
                    text: TextSpan(
                      children: <TextSpan>[
                        TextSpan(
                            text: 'Jane Doe ',
                            style: TextStyle(color: Colors.grey)),
                        TextSpan(
                          text: '- Business',
                          style: TextStyle(
                              fontWeight: FontWeight.w900, color: Colors.black),
                        ),
                      ],
                    ),
                  ),
                  SizedBox(height: 12),
                  Text(
                    'FCTA 34,700',
                    style: TextStyle(color: Colors.green, fontSize: 14),
                  ),
                  SizedBox(height: 20),
                  Expanded(child: Divider()),
                  SizedBox(height: 5),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      Text(
                        'New Transfer',
                        style: TextStyle(color: Colors.green),
                      ),
                      Text(
                        'Recharge',
                        style: TextStyle(fontWeight: FontWeight.w900),
                      ),
                    ],
                  )
                ],
              ),
            ),
          ),
          Positioned(
            top: -20,
            left: 8,
            child: Card(
              elevation: 4,
              color: Colors.green,
              child: Padding(
                padding: const EdgeInsets.symmetric(
                    horizontal: 22.0, vertical: 18.0),
                child: Center(
                  child: Text(
                    "\$",
                    style: TextStyle(color: Colors.white, fontSize: 20),
                  ),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}