Is there any option (or css definition) to set the image size in the lightbox?

Right now it’s full screen, which is kind of nice; however with 4K and 5K monitor screens it might be too large, and the images need to be of that size too (which creates large files for enough quality).

I’m not sure if I need/want/like a pixel setting, of a percentage.

If you have a css solution, that would be nice too 😉

Cheers,
Marc