Line in 1px

Question

HTML

Where did it come from and how to fix it? Code

Browser: Google Chrome Canary

Answer 1

FF does not have this line.
Try doing this:
background-position: left center;
border: 0

Answer 2

These are background-size tricks under the webkit. I can't say anything more.

Answer 3

By the way, you can get rid of: by doing: Of course, it does not help to solve the problem, but in the end the file size is slightly smaller. And by the way, why are you using such a large picture for such a small block, make the background fit the size of the block and give up CSS3 for now?
position:absolute;
left:50%;
margin-left:-400px;

margin: 0 auto;