MyBB Community Forums

How to remove the excess the bottom border to 1px in hiding blocks?

This problem is only in browsers Chrome and Safari.

forum URL please ...

My forum is while only on localhost. This problem is visible at all forums if to look through browsers Chrome or Safari.
Problem and at community.mybb.com:
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How to remove the excess at the border bottom of the blocks that the screenshots in browsers Chrome and Safari?

I'm using Chrome and it's perfect for me.

^ I was also unable to reproduce the problem ...

How remove this the border in Chrome?