It might be worth giving the folks who created the plugin a shout. It may be something they’ve seen before.
Not sure if there’s a way to do it with CSS, since it’s not actually part of the page, but more an absence while the images load. Otherwise it would already be the same as the background color.
Envira does have a CSS Addon, but not sure if it would help.
https://enviragallery.com/addons/css-addon/
I see now. Sorry I misunderstood that this was “when images are loading” (even though you wrote that).
What’s the theme you’re using?
Hi there.
Did you resolve this? I’m seeing the borders as grey now.
Just updated WP and finding the same thing.
In fact, it seems to be stuck with the content it included prior to the update. I just added a new post, and it’s not showing up in the list.