/usr/share/themes/Numix/xfwm4/themerc is in numix-gtk-theme 2.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | # Name: Numix xfwm4 theme
# Author: Satyajit Sahoo <satyajit.happy@gmail.com>
# License: GPL-3.0+
active_text_color=#eeeeee
inactive_text_color=#888888
button_offset=3
button_spacing=0
show_app_icon=true
full_width_title=true
maximized_offset=0
title_horizontal_offset=3
title_shadow_active=false
title_shadow_inactive=false
title_vertical_offset_active=0
title_vertical_offset_inactive=0
title_shadow_active=false
title_shadow_inactive=false
shadow_delta_height=0
shadow_delta_width=0
shadow_delta_x=0
shadow_delta_y=0
shadow_opacity=30
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