Theme not applying to client?

Hi, I managed to finally switch from Discord to TeamSpeak 3; however, my issue is that custom themes do not work or apply to TeamSpeak 3 for odd reasons. Meanwhile, on Linux, I have never had any issues like this. I’m more used to dark theme clients; however, I attempted to use a community-made dark theme for TeamSpeak 3, and for some reason nothing worked!

Is there a .deb file perchance i could find?