title: Flutter: How to make a Card overlap the AppBar?
body: <p>How can I make a <code>Card</code> in Flutter that overlaps the <code>AppBar</code>? Negative margins are not possible as far as I know.</p>
  
  <p>See the image for clarity.</p>
  
  <p><a href="https://i.stack.imgur.com/LumpZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/LumpZ.png" alt="&lt;code&gt;Card&lt;/code&gt; floating above the &lt;code&gt;AppBar&lt;/code&gt;"></a></p>