Change the background of the pop up overlay

Hi guys I need to change the color of the background of the overlay popup.

Is it possible?

At this moment is white, with 0.45 opacity. I need black with 0.8 opacity.

Thank you!

Hi,

Overlay popup from product gallery widget? I'm not sure, because the color there is not white with 0.45 opacity, could you provide more details or a screenshot?

I solved piotr! thank you very much.