I'm probably missing something, but wouldn't applying a 30px left and right margin to the specific container work? E.g.: http://jsfiddle.net/xyM48/ http://jsfid

I'm probably missing something, but wouldn't applying a 30px left and right margin to the specific container work? E.g.: http://jsfiddle.net/xyM48/ http://jsfiddle.net/xyM48/ The -15px margin on the rows and 15px margin on the columns would still do their job, only that the rows would be 15 pixels smaller.