/usr/share/themes/TraditionalGreen/gtk-3.0/settings.ini is in mate-themes 3.22.16-4ubuntu1.
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 | [Settings]
gtk-color-scheme = "base_color:#ffffff\nbg_color:#edeceb\nfg_color:#000000\nselected_bg_color:#B9C0A9\nselected_fg_color:#42453E\ntooltip_bg_color:#EAF5B5\ntooltip_fg_color:#000000\ntext_color:#1a1a1a\nlink_color:#0000ee\nvisited_link_color:#551a8b"
gtk-auto-mnemonics = 0
gtk-visible-focus = automatic
gtk-primary-button-warps-slider = false
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