Warnings when launching any GTK application

[gnolooo]

When launching any GTK application from command line, the following warnings appear:

(resources:29475): Gtk-WARNING **: 10:12:55.266: Theme parser error: gtk.css:4963:12-17: "shade" is not a valid color name.

(resources:29475): Gtk-WARNING **: 10:12:55.266: Theme parser error: gtk.css:5023:12-17: "shade" is not a valid color name.

(resources:29475): Gtk-WARNING **: 10:12:55.266: Theme parser error: gtk.css:5050:12-15: "mix" is not a valid color name.

(resources:29475): Gtk-WARNING **: 10:12:55.266: Theme parser error: gtk.css:5054:12-15: "mix" is not a valid color name.

(resources:29475): Gtk-WARNING **: 10:12:55.267: Theme parser warning: gtk.css:5255:3-5256:1: Expected ';' at end of block

(resources:29475): Gtk-WARNING **: 10:12:55.267: Theme parser error: gtk.css:5286:3-19: No property named "-gtk-icon-effect"

[siddhpant]

Should be fixed by #170