import'package:flutter/material.dart';voidmain() {runApp(constMyApp());}classMyAppextendsStatelessWidget {constMyApp({super.key});@overrideWidgetbuild(BuildContext context) {returnMaterialApp(      title:'Flutter Stack Layers',      theme:ThemeData(        primarySwatch:Colors.blue,        visualDensity:VisualDensity.adaptivePlatformDensity,      ),      home:constMyHomePage(),      debugShowCheckedModeBanner:false,// Optional: Hide the debug banner    );  }}classMyHomePageextendsStatelessWidget {constMyHomePage({super.key});@overrideWidgetbuild(BuildContext context) {returnScaffold(      appBar:AppBar(title:constText('600x600 Stack with 3 Layers')),      body:Center(        child:SizedBox(          width:600,          height:600,          child:Stack(            children:<Widget>[Container(color:Colors.black),Align(                alignment:Alignment.topCenter,                child:Container(                  width:600,                  height:299,                  child:Image.network('https://picsum.photos/600/300?random=1',                    fit:BoxFit.cover,                  ),                ),              ),Align(                alignment:Alignment.topCenter,                child:Container(                  width:600,                  height:300,                  decoration:constBoxDecoration(                    gradient:LinearGradient(                      begin:Alignment.bottomCenter,                      end:Alignment.topCenter,                      colors: [Colors.black,Colors.transparent],                    ),                  ),                ),              ),            ],          ),        ),      ),    );  }}