Version: 53.0.2785.55 (Official Build) beta (64-bit)
OS: ChromeOS 8530.49.0 (Official Build) beta-channel samus

What steps will reproduce the problem?
(1) Touch drag or mousewheel vertically on the background.

What is the expected output?
Nothing should happen.

What do you see instead?
Instead, the login pods scroll up and down by about 50px.

Please use labels and text to provide additional information.