Centering Dashboard Within a Dashboard

Here's the scenario I'm trying to figure out:

My main dashboard has 3 columns which contain 3 different dashboards.  The left and right dashboards are just for navigation and have a set width. I want the middle dashboard to be center aligned with the available space left over after the left and right dashboards are populated.

Basically I'm trying to design the dashboard so that it's readable from a laptop screen but on a normal monitor I want the main section of the dashboard (the middle) to fill in all of the empty space and center align horizontally.

I hope that makes sense?

Thanks,

Brandon