Today, I was playing a game with @Phrancis and I noticed that, as I was clicking the various buttons on the cards to see what the card did, the info boxes would stack up on top of each other:

I think it would be better if, when one box was opened, the currently open one was closed.
Also, because of my familiarity with other things like this (perhaps right-click drop down menus), I find myself trying to click away from the card to hide the info box, similar to how you would hide the right-click menu.
If I am not alone on this, I think it would be nice if the info boxes hid if you clicked away from them.