title: how open box below container and other body is blur in flutter
body: <p>I am trying to add blur to a container that will receive a label. After reading a little about BackdropFilter, I was able to add it to the container. But it got that aspect. Is it possible to add a Radius in a blur?</p>
  <p><strong>Screenshot of the issue:</strong><br />
  <a href="https://i.stack.imgur.com/wEdoJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wEdoJ.png" alt="enter image description here" /></a></p>