Chrome Version       : 66.0.3359.67
OS Version: 10452.30.0
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari:
    Firefox:
    IE/Edge:

What steps will reproduce the problem?
0. Activate night mode.
1. Play a video using the plex web player (https://plex.tv/web)
2. Enter full screen.

What is the expected result?
The bars at the top and the bottom should go away.

What happens instead of that?
They start sliding out and then they reappear. This does not happen without night mode active.

Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (X11; CrOS x86_64 10452.30.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.67 Safari/537.36