#navColumnOneWrapper, #navColumnTwoWrapper, #mainWrapper
margin:auto;
}

removing margin will shift the page to the left .
Just removing the margin from all of those will have negative results - both of the side columns would move to the left

You would be better to do:


#navColumnOneWrapper, #navColumnTwoWrapper /*, #mainWrapper*/
margin:auto;
}

removing margin will shift the page to the left .