Card Widget

 import "package:flutter/material.dart";

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

class MyApp extends StatelessWidget
{
  const MyApp({super.key});

  @override
  Widget build(BuildContext context)
  {
    return MaterialApp(
      title: "Hello",
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.teal,
      ),
      home: const FlutterApp(),
    );
  }
}

class FlutterApp extends StatelessWidget
{
  const FlutterApp({super.key});

  @override
  Widget build(BuildContext context)
  {
    return Scaffold(
      appBar: AppBar(
        title: const Text("Hello Flutter Application",
          style: TextStyle(fontWeight: FontWeight.bold),
        ),
        centerTitle: true,
        backgroundColor: Colors.grey,
      ),
      body: const Center(
        child: Card(      //"Card" Widget provides shadow. creates illusion.
          shadowColor: Colors.red,    //"shadow" gives desired color shadow effect.
          elevation: 12,   //"elevation" gives shadow size.
            child: Padding(
              padding: EdgeInsets.all(8.0),
              child: Text("Hello, How are you ?"),
            )),
      ),
    );
  }
}