/usr/share/themes/GreenLaguna/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 | [Settings]
gtk-color-scheme = "base_color:#E6EFE3\nbg_color:#E6EFE3\ntooltip_bg_color:#333433\nselected_bg_color:#6F816A\ntext_color:#000000\nfg_color:#101010;\ntooltip_fg_color:#ffffff\nselected_fg_color:#ffffff"
gtk-auto-mnemonics = 1
gtk-visible-focus = automatic
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