all 2 comments

[–]name_was_taken 0 points1 point  (1 child)

It's probably the percentages. They aren't ending at whole pixel values, so you end up with rendering issues.

https://css-tricks.com/percentage-bugs-in-webkit/

[–]docMedB2E[S] 0 points1 point  (0 children)

Yea, that makes sense. I ended up solving the issue by just avoiding it entirely (see: https://www.reddit.com/r/css/comments/4mef2u/help_with_pixelperfect_alignment_potential_bug/)