www.wysiwygwebbuilder.com

Hi, is it possible to set the background of the 'Gallery mode' 'Light Box Gallery' window to set to solid (100 % non transparent)?
horst

Each (third party) lightbox script has its own settings.
So, depending on which lightbox you have used, you will need to check the documentation to see how to change the background.

See also:
https://www.wysiwygwebbuilder.com/lightboxes.html