Hero animation second page

Herosecondpage.dart

import 'package:flutter/material.dart';

class Second extends StatelessWidget{
  @override
    Widget build(BuildContext context) {
      
      return Scaffold(
        appBar: AppBar(
          title: Text("Second Screen"),
        ),
        body: Center(
          child: Container(
            child: Hero(
              tag: "mainImage",
              child: Image.network("https://matwrites.com/wp-content/uploads/2018/03/Flutter.png"),
            ),
          ),
        ),
      );
    }
}