Computer Learning

[Wildbilly]

When you say 'dark' do you mean a black blank as seen in the following link?

http://www.windowswally.com/how-to-fix-the-black-video-screen-in-windows-10/

or a dark background as seen in Opera's 'Focus On Videos" Opera extension

which is like Chrome's "Turn out the lights"?

https://techdows.com/2010/11/focus-on-videos-extension-for-opera-is-like-turn-off-lights-chrome-extension.html