title: icon above center showModalBottom Flutter
body: <p>How do I make the icon in showModalBottom above the middle, like the picture above, I made it using a container and set the position to positioned but it was cut off when I set the top to negative, like the following picture</p>
  <p><a href="https://i.stack.imgur.com/LWjN4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LWjN4.png" alt="enter image description here" /></a></p>