Black border inside ghostty

[schlesserr]

I don't know if it's related with ghostty, i3 or picom, but it bothers me.
Anyone could suggest a fix to this black border on dropdown menu inside ghostty?

Like in the screenshot below:

[SeleneCosmia]

I have the same black box on the popup while running X11(awesome-WM) without picom running, so it may just be ghostty itself?

[schlesserr]

Nope, is caused by GTK.
Look at these solutions.

#3185