This file is indexed.

/usr/share/themes/Xfce-flat/gtk-3.0/gtk.css is in gtk3-engines-xfce 3.2.0-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* default color scheme */
@define-color bg_color #d9dadb;
@define-color fg_color #2d2d2d;
@define-color base_color #fcfcfc;
@define-color text_color #2d2d2d;
@define-color selected_bg_color #1e9cc8;
@define-color selected_fg_color #eeeeee;
@define-color tooltip_bg_color #ffffdf;
@define-color tooltip_fg_color #2d2d2d;

/* colormap actually used by the theme, to be overridden in other css files */
@define-color theme_bg_color @bg_color;
@define-color theme_fg_color @fg_color;
@define-color theme_base_color @base_color;
@define-color theme_text_color @text_color;
@define-color theme_selected_bg_color @selected_bg_color;
@define-color theme_selected_fg_color @selected_fg_color;
@define-color theme_tooltip_bg_color @tooltip_bg_color;
@define-color theme_tooltip_fg_color @tooltip_fg_color;

/* shadow effects */
@define-color light_shadow #fff;
@define-color dark_shadow #000;

/* misc colors used by gtk+ */
@define-color info_fg_color rgb (0, 0, 0);
@define-color info_bg_color rgb (252, 246, 202);
@define-color warning_fg_color rgb (0, 0, 0);
@define-color warning_bg_color rgb (250, 173, 61);
@define-color question_fg_color rgb (255, 255, 255);
@define-color question_bg_color rgb (57, 142, 231);
@define-color error_fg_color rgb (255, 255, 255);
@define-color error_bg_color rgb (237, 54, 54);
@define-color link_color #5177ac;
@define-color success_color #4e9a06;
@define-color warning_color #f57900;
@define-color error_color #cc0000;

/* widget colors */
@define-color menubar_bg_color @theme_bg_color;
@define-color menubar_fg_color @theme_fg_color;
@define-color toolbar_bg_color @theme_bg_color;
@define-color toolbar_fg_color @theme_fg_color;
@define-color menu_bg_color shade(@theme_bg_color, 1.18);
@define-color menu_fg_color @theme_fg_color;
@define-color panel_bg_color #686868;
@define-color panel_fg_color #fcfcfc;

/* osd */
@define-color osd_base #333;
@define-color osd_fg #eee;
@define-color osd_bg alpha(@osd_base, 0.8);

/* window manager colors */
@define-color wm_bg_a shade(@theme_bg_color, 1.07);
@define-color wm_bg_b @theme_bg_color;
@define-color wm_title_focused shade(@theme_fg_color, 1.2);
@define-color wm_title_focused_shadow shade(@theme_bg_color, 1.2);
@define-color wm_title_unfocused shade(@theme_fg_color, 2.0);
@define-color wm_title_unfocused_shadow shade(@theme_bg_color, 1.1);
@define-color wm_border_focused shade(@theme_bg_color, 0.7);
@define-color wm_border_unfocused shade(@theme_bg_color, 0.8);

/* lightdm greeter color scheme */
@define-color lightdm_bg_color #242424;
@define-color lightdm_fg_color #efefef;

@import url("gtk-widgets.css");
@import url("apps/gnome-applications.css");
@import url("apps/granite-widgets.css");
@import url("apps/unity.css");
@import url("apps/lightdm-unity-greeter.css");
@import url("apps/lightdm-gtk-greeter.css");
@import url("apps/xfce.css");