Unexplained Gap in Header

I tried to add a nav bar above my header image. I made it in Photoshop and spliced it into different pieces so I could hyperlink it. Now, I made the width perfect so it wouldn’t overflow to the next line AND look nice. However, there appears to be a gap between the buttons (blog and about) if you look carefully. How do I get rid of that?

Thanks in advance//
http://www.jaypo.tk
http://jaypo.site88.net/blog/