ipad black border slightly thick

I don't want to sound picky or anything but I noticed the top and right black border a bit too thick than the bottom and left. It bothers me when I'm reading when I'm using ibook, adjusting the color paper background DOES help with the annoyance but would like to have this fixed.

Will apple accept my ipad and exchange it with another?

The black border is really annoying. 😕

If you're wondering, here's a picture and I've circled the borders that's a bit too thick.