UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Example URL:
https://jsfiddle.net/sg1gzk3j/1/

Steps to reproduce the problem:
1. https://jsfiddle.net/sg1gzk3j/1/
2. move the scrollbar in the iframe

What is the expected behavior?
background image should stay attached bottom-right when scrolling

What went wrong?
background image moves in the opposite scroll direction

Does it occur on multiple sites: N/A

Is it a problem with a plugin? No 

Did this work before? Yes 64

Does this work in other browsers? Yes

Chrome version: 66.0.3359.181  Channel: n/a
OS Version: 10.0
Flash Version: