Centering the content of the center column

I currently have the theme set to a fluid width which I prefer but I am having issue with a player I have on a page I can define the width of the player but when I do so so it fits nicely, it bleeds over into the right column at lower resolution.

My solution was to set the width of the player to fit at a lower resolution but at higher resolution its left justified which looks not so nice. How do I specify that the content of the center column should be centered so that at either resolution the player will be centered?

or is there a more elegant solution via the theme settings?