Closing Windows in Champ Select

This isn't necessarily a bug, but when in Champ Select if you've moved your client to the side for something and you open the Runes or Masteries page there's no way to close it because the close button falls off the screen.

Is there a hotkey I don't know about for closing those windows or is there really no fix for this? You can't move the client with a window open, and this is the 4th time I've been temp banned for not picking or banning (some friends in premade have done it too).