I half agree with you. It's definitely a problem and I shouldn't have to zoom out for the game to display correctly, but I don't know if centering the game would make things more frustrating or not. I can't scroll the page with a mouse wheel when my cursor is in the game window, meaning that at default zoom the only place I can use my mouse wheel to scroll is on that little strip on the left side of the page. If the game were centered, that strip would be gone and I wouldn't be able to mouse wheel scroll at all.