/usr/share/themes/Today/xfwm4/themerc is in xfwm4-themes 4.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | active_text_color=#ffffff
active_text_shadow_color=#43486B
button_layout=O|HMC
button_offset=0
button_spacing=0
full_width_title=true
inactive_text_color=#ffffff
title_shadow_active=true
title_shadow_inactive=true
|