title: Flutter modal bottom sheet the little black thing
body: <p>my question might sound a bit off but how to make this thing ? i'am not sure what is called i'm sorry
  <a href="https://i.stack.imgur.com/ZRogp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZRogp.png" alt="enter image description here" /></a></p>