Syntax

              BoxShadow({
                  Color color = const Color(0xFF000000),
                  Offset offset = Offset.zero, 
                  double blurRadius = 0.0, 
                  double spreadRadius = 0.0, 
                  BlurStyle blurStyle = BlurStyle.normal
                })

                

                
                import 'package:flutter/material.dart';
 
 void main() => runApp(const MyApp());
  
 class MyApp extends StatelessWidget {
   const MyApp({Key? key}) : super(key: key);
  
   static const String _title = 'Flutter Tutorial';
  
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       title: _title,
       home: Scaffold(
         appBar: AppBar(title: const Text(_title)),
         body: const MyStatefulWidget(),
       ),
     );
   }
 }
  
 class MyStatefulWidget extends StatefulWidget {
   const MyStatefulWidget({Key? key}) : super(key: key);
  
   @override
   State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
 }
  
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   @override
   Widget build(BuildContext context) {
     return Center(
       child: Column(
         children: <Widget>[
           const SizedBox(height: 20,),
           Container(
             height: 150,
             width: 150,
             alignment: Alignment.center,
             decoration: BoxDecoration(
               borderRadius: BorderRadius.circular(10),
               boxShadow: const [
                 BoxShadow(
                   color: Colors.grey,
                   blurRadius: 5,
                   spreadRadius: 1,
                   offset: Offset(4, 4)
                 ),
               ],
               color: Colors.green[200],
             ),
             child: const Text('Container 1'),
           ),
           const SizedBox(height: 20,),
           Container(
             height: 150,
             width: 150,
             alignment: Alignment.center,
             decoration: BoxDecoration(
               borderRadius: BorderRadius.circular(10),
               boxShadow: const [
                 BoxShadow(
                     color: Colors.blue,
                     blurRadius: 3,
                     spreadRadius: 5,
                     offset: Offset(0, 0)
                 ),
                 BoxShadow(
                     color: Colors.red,
                     blurRadius: 5,
                     spreadRadius: 1,
                     offset: Offset(5, 5)
                 ),
               ],
               color: Colors.green[200],
             ),
             child: const Text('Container 2'),
           ),
           const SizedBox(height: 20,),
           Container(
             height: 150,
             width: 150,
             alignment: Alignment.center,
             decoration: BoxDecoration(
               borderRadius: BorderRadius.circular(10),
               boxShadow: const [
                 BoxShadow(
                     color: Colors.deepPurpleAccent,
                     blurRadius: 10,
                     spreadRadius: 0,
                     offset: Offset(0, 0)
                 ),
               ],
               color: Colors.green[200],
             ),
             child: const Text('Container 3'),
           ),
         ]
       ),
     );
   }
 }
                

BoxDecoration()