Opera won't start.

A Former User

Arch User,
Heard a bunch of nice things about opera so I decided to give it a try and pulled it from the official repositories.
I am not able to really start the application, to be more exact it opens a gray window. I did try starting it from the terminal to see if it might show some errors, and it did.

(opera:14987): Gtk-WARNING **: 22:52:51.571: Theme parsing error: gtk-widgets-assets.css:161

(opera:14987): Gtk-WARNING **: 22:52:51.571: Theme parsing error: gtk-widgets-assets.css:162

(opera:14987): Gtk-WARNING **: 22:52:51.571: Theme parsing error: gtk-widgets-assets.css:163

(opera:14987): Gtk-WARNING **: 22:52:51.572: Theme parsing error: gtk-widgets-backdrop.css:1

(opera:14987): Gtk-WARNING **: 22:52:51.572: Theme parsing error: gnome-applications.css:71:

(opera:14987): Gtk-WARNING **: 22:52:51.572: Theme parsing error: gnome-applications.css:72:

(opera:14987): Gtk-WARNING **: 22:52:51.572: Theme parsing error: gnome-applications.css:107

(opera:14987): Gtk-WARNING **: 22:52:51.572: Theme parsing error: granite-widgets.css:99:33:

(opera:14987): Gtk-WARNING **: 22:52:51.573: Theme parsing error: granite-widgets.css:255:39
Discarded=1
Discarded=1
Discarded=1
Discarded=1
CrashID=9a8889dd-2990-4d42-8a7c-a064f2181215
Discarded=1

I use i3-gaps but I don't assume that should be related to the issues.