I'm sorta new to design, I'm working on a site using background images fixed to x

I'm using a "header" and a "footer" image on top and bottom (obviously) and they won't stretch fully across, they're a few pixels away from the edge of the page. How can I fix this?

Epic visual tool

Epson 5030UB 2D/3D 1080p 3LCD Projector Submitted October 01, 2015 at 07:19AM by WoeIsTravis_ http://ift.tt/1hcLTDU