title: How to overlap button on BottomSheet in Flutter?
body: <p>In my design, there is a close button in the <code>BottomSheet</code>. I have tried <code>Stack</code>. But it didn't work. Does anyone know how to achieve the result? Thanks :)</p>
  <p><a href="https://i.stack.imgur.com/cas1W.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cas1W.png" alt="Overlap Button in BottomSheet" /></a></p>
  <pre class="lang-dart prettyprint-override"><code>
  modalBottomSheet(context) {
    return showModalBottomSheet(
      context: context,
      builder: (context) {
        return Stack(
          children: [
            Container(
              child: Text('Sample Text'),
            ),
            Container(
              height: 50,
              width: 50,
              decoration: BoxDecoration(
                color: Colors.red,
                shape: BoxShape.circle,
              ),
            ),
          ],
        );
      }
    );
  }
  
  </code></pre>