title: Scroll background container in Flutter
body: <p>I am trying to build scrollable screen, where brown background Container must scroll with List of elements when black container near this container.
  How can I do it?
  I thought about Positioned, but I can't build items above SliverAppbar even if I build it in different Stack.</p>
  <p>May I build body above SliverAppbar or how can I realise this?</p>
  <p><a href="https://i.stack.imgur.com/zSy7M.png" rel="nofollow noreferrer"></a></p>
  <pre><code>return Scaffold(
    body: Stack(
      children: [
        Container(
          height: MediaQuery.of(context).size.height * 0.45,
          decoration: const BoxDecoration(
            color: AppColors.mainBrown,
            borderRadius: BorderRadius.vertical(bottom: Radius.circular(30)),
          ),
        ),
        CustomScrollView(
          slivers: [
            const SliverAppBar(
              expandedHeight: 70,
              backgroundColor: Colors.transparent,
              elevation: 0,
              shadowColor: Colors.transparent,
              titleSpacing: 22,
              title: Text('AppBar'),
            ),
            SliverPadding(
              padding: const EdgeInsets.symmetric(horizontal: 30),
              sliver: SliverList(
                delegate: SliverChildListDelegate([
                  Card(
                    child: Container(
                      color: Colors.brown,
                      height: 200,
                    ),
                  ),
                  Card(
                    child: Container(
                      color: Colors.yellow,
                      height: 250,
                    ),
                  ),
                  Card(
                    child: Container(
                      color: Colors.black,
                      height: 300,
                    ),
                  ),
                  Card(
                    child: Container(
                      color: Colors.red,
                      height: 50,
                    ),
                  ),
                  Card(
                    child: Container(
                      color: Colors.green,
                      height: 100,
                    ),
                  ),
                  Card(
                    child: Container(
                      color: Colors.blue,
                      height: 150,
                    ),
                  ),
                ]),
              ),
            )
          ],
        ),
      ],
    ),
  );
  </code></pre>