This a fork of the McOS-transparent theme from paullinuxthemer, which can be found here.
This is a gnome-theme that contains a modified GTKRC and GTK.CSS. As such it licence is GPLv2, of which the downloaded file contains a copy.
GRAND GTK.CSS FILE is a modified GTK.CSS with each element its own settings
Created by PAULXFCE (2017)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.