title: IOS/Storyboard/Autolayout: Center round button under horizontal bar
body: <p>This should be incredibly simple but somehow has proven incredibly complicated for me with auto layout.
  I have a horizontal bar shaped button.  I want to center a round information icon below it.  Auto layout keeps trying to stretch the round button into an oval and is not centering it from left to right as in the following:</p>
  
  <p><a href="https://i.stack.imgur.com/AoMEE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AoMEE.png" alt="enter image description here"></a></p>
  
  <p>The above is the result of the following constraints that should work but don't.</p>
  
  <p><a href="https://i.stack.imgur.com/jk2Uc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jk2Uc.png" alt="enter image description here"></a></p>
  
  <p>Can anyone please tell me the correct constraints to add to accomplish this simple task.</p>
  
  <p>Thank you.</p>