/usr/share/themes/Xfce-flat/gtk-3.0/settings.ini is in gtk3-engines-xfce 3.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [Settings]
gtk-color-scheme = "base_color:#fcfcfc\nbg_color:#d9dadb\ntooltip_bg_color:#ffffdf\nselected_bg_color:#1e9cc8\ntext_color:#2d2d2d\nfg_color:#2d2d2d\ntooltip_fg_color:#2d2d2d\nselected_fg_color:#eeeeee\nlink_color:#5177ac"
gtk-auto-mnemonics = 1
gtk-visible-focus = automatic
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