Remove padding around header

Hello. On my site being created www.packagingproductions.com.au , when I upload the header, there is when using the dark or light default colour options, a dark padded area above, below, left and right of the header which I want to be the same width as the slider and not have the padding above and below the header. In the light default version this area is white. What is the easiest correct way to remove this area?