System: Linux Mint 18.2 Sonya

I want to change my background color of my pdf-reader "xreader".
I don't mean to invert the DinA4-sheets by pressing
ctrl + i,
but the background-color behind the pages, which is by default lightgray. Working a lot at night makes it really uncomfortable for the eyes, if its shining too bright on the left and right side.

Is there anywhere a configuration file where I can change the background/backdrop color, for example by changing an RGB or HEX color code?

Screenshot of xreader

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