title: Resize scaffold in flutter
body: <h3>Project</h3>
  <p>Hi, I'm trying to make some custom transition in flutter between two simple screen. My goal is to use <code>Navigator.push(context, MyRoute(..))</code> to call another the second screen on top of the first one. My problem is that I want the second screen to be only half size of the height of the device. The rest of the screen should only display the old page, maybe with some kind of blur.
  I'm searching for a BottomSheet style effect but without using the actual widget.</p>
  <h3>Problem</h3>
  <p>No matter what I try, when <code>Navigator.push</code> is called, the new screen will always be resized to fill the entire screen and I'm unable to get a smaller scaffold on top with some transparency to hide the old page.</p>
  <p>Thanks</p>