Playback of contend very dark from center to left in WebApp

[MarkusW 2]

Hi since some weeks i recognice that the playback in the Webapp is very dark from the center to the left side of the screen. 
It happend on diffrend Monitors but always on a Linux Desktop in Chromebrowser. 

Here a screen shot of that what i see.

 

What could it be ?

 

Markus

[Luke 42077]

Hi. Do you have any custom css? Try removing that.

[MarkusW 2]

... yes i had. 

... removed and  problem is gone

 

Thanks lot !