title: Image is not showing with Positional widget
body: <p>Image is not showing as I wrap the container with positioned Widget and give top any value as removed the value it is showing up. Why is that.</p>
  <p>========================================================================================================================================================================================================================================================================================================================================================================================================
  Here is the Code</p>
  <pre><code>import 'package:flutter/material.dart';
  
  class MyHomePage extends StatefulWidget {
    const MyHomePage({Key? key}) : super(key: key);
  
    @override
    State&lt;MyHomePage&gt; createState() =&gt; _MyHomePageState();
  }
  
  class _MyHomePageState extends State&lt;MyHomePage&gt; {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
        body: SingleChildScrollView(
          child: Column(
            children: [
              SizedBox(
                height: MediaQuery.of(context).size.height * 2,
                child: Stack(
                  children: [
                    Positioned(
                      top: 1,
                      child: Container(
                        // height: 30,
                        // color: Colors.red,
                        height: MediaQuery.of(context).size.height * 1 - 17,
                        decoration: const BoxDecoration(
                          image: DecorationImage(
                            image: AssetImage('home/h_intro-s1-l1.jpg'),
                            fit: BoxFit.fill,
                          ),
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ),
      );
    }
  }
  
  </code></pre>