title: How do I make rounded corners on app screen?
body: <p>As some of you may have noticed, most (if not all) of system apps show the screen with rounded corners. I mean, the four corners of the device screen look rounded.</p>
  
  <p>However, most of third party apps don't (the corners are 90º), but I've seen some that do, as Facebook messenger. Many others have this effect but only on the splash screen (which may be only a modification to the default.png image file)</p>
  
  <p>Is there a property to achieve this effect?</p>