title: How to add custom container to form
body: <p>I'm new to flutter. I'm trying to build register and login app.
  but I faced an issue. My problem is that I have this container</p>
  <pre><code>class Background extends StatelessWidget {
    final Widget child;
  
    const Background({
      Key? key,
      required this.child,
    }) : super(key: key);
  
    @override
    Widget build(BuildContext context) {
      Size size = MediaQuery.of(context).size;
  
      return Container(
        child: Stack(
          alignment: Alignment.center,
          children: &lt;Widget&gt;[
            Positioned(
              top: 0,
              right: 0,
              child: Image.asset(
                  &quot;assets/images/img1.png&quot;,
                  width: size.width
              ),
            ),
            Positioned(
              top: 0,
              right: 0,
              child: Image.asset(
                  &quot;assets/images/img2.png&quot;,
                  width: size.width
              ),
            ),
            child
          ],
        ),
      );
    }
  }
  </code></pre>
  <p>I need to include this container in Scaffold here to take the design
  but I didn't know how can I do that.</p>
  <pre><code> return Scaffold(
        body: Form(
          key: formkey,
          child: Column()));
                                          
  </code></pre>
  <p>Can Anyone help me to do that please</p>