Is it possible to wrap a column in a column so it makes like a wrapper div? or is there another approach to making a wrapper div in the grid?

My situation is that I have a background of black and a div that has a background of white. I set the max-width of the div to 1200 and then center it, well this works, but the background color of black now shows where the margins are on the left and the right, so I was think I would use a wrapper div to hold wrap the grid column, but I can't figure out how to do it?