Window title bug on KDE

[xurich-xulaco]

Even though a GTK theme doesn't need to work 100% on any Qt based DE, I've seem to stumbled upon a strange occurrence with gtk based apps, as the window titles are strangely transparent and not in all cases:

White:

Black

[Elbullazul]

Headerbars have some transparency in the code, so it's probably what's causing the issue.

You're probably using the GTK 3 theme, right? Try editing the color in line 1588 of gtk-dark.css to

background-color: rgba(31, 31, 31, 1);