I want to change the overlay color to be #fff; (see attached)
I also want to change what happens when the user clicks the image. Currently it opens the image in a lightbox preview, but I’d like to link the image as a button to a new page. Its currently set up like the screenshot attached.
Sorry for our late response.
If you are using single image element, then in attached screenshot you can see how to do that (firstly enter URL and then disable lightbox).
About overlay color, can you give us more information about where you want to change it?