Different colors in eventlist and calendar popup (xlightbox)

I have an eventlist that is above a dark photo, whole site has black background), and the text is white (so no background color).
The text color and background in the popup under calendar (xlightbox) will both be white.
Is there any possibility to change either the text color in xlightbox or the background of xlightbox.
I have tried this via the settings and CSS but then the event list is also changed (which is not allowed).

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