Safari on iOS:
Search for something, in my case I tested, “what is the meaning of life”. So far so good. You cannot scroll left or right since it’s designed to scale to the viewport. Hit the quick answer button and now there’s an extra blank space on the right of the page. Perhaps the quick answer panel’s width exceeds the width of the rest of the page. 
The page width should remain consistent and you should not be able to scroll horizontally.
