title: Put a Sized box to add a widget between List view buiilder and AppBar in flutter
body: <p>This might be very easy but I just can't figure out how to put a widget between list view builder and app bar. Here is the code I'm using.</p>
  <pre><code>body: Padding(
      padding: const EdgeInsets.all(8.0),
      child: ScrollWrapper(
        promptAlignment: Alignment.bottomRight,
        promptTheme: const PromptButtonTheme(
          icon: Icon(
            Icons.arrow_upward_rounded,
            color: Colors.white,
            size: 20,
          ),
          color: Colors.black87,
        ),
        builder: (context, properties) =&gt; ListView.builder(
          itemCount: 20,
          itemBuilder: (BuildContext context, int index) {
            return Container(
              height: 500,
              margin: EdgeInsets.symmetric(
                horizontal: width &gt; 700 ? width * 0.2 : 8,
                vertical: 6,
              ),
              child: PostCard(),
            );
          },
        ),
      ),
    ),
  </code></pre>
  <p>I tried putting ScrollWrapper inside a column and added the sized box to call my widget but it isn't working.</p>
  <p>Here is an illustration of the layout I want.</p>
  <p><a href="https://i.stack.imgur.com/LPofN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LPofN.png" alt="enter image description here" /></a></p>
  <p>Can anyone point out where am I going wrong?</p>