This file is indexed.

/usr/share/themes/Radiant-MATE/gtk-3.0/gtk-main.css is in ubuntu-mate-themes 16.04.6.

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 #f2f1f0;
@define-color fg_color #4c4c4c;
@define-color base_color #ffffff;
@define-color text_color #3C3C3C;
@define-color selected_bg_color #87A752;
@define-color selected_fg_color #ffffff;
@define-color tooltip_bg_color #000000;
@define-color tooltip_fg_color #ffffff;

/* misc colors used by gtk+
 *
 * Gtk doesn't currently expand color variables for style properties. Thus,
 * gtk-widgets.css uses literal color names, but includes a comment containing
 * the name of the variable. Please remember to change values there as well
 * when changing one of the variables below.
 */
@define-color info_fg_color rgb (181, 171, 156);
@define-color info_bg_color rgb (252, 252, 189);
@define-color warning_fg_color rgb (173, 120, 41);
@define-color warning_bg_color rgb (250, 173, 61);
@define-color question_fg_color rgb (97, 122, 214);
@define-color question_bg_color rgb (138, 173, 212);
@define-color error_fg_color rgb (235, 235, 235);
@define-color error_bg_color rgb (223, 56, 44);
@define-color link_color #A7BB85;
@define-color success_color #4e9a06;
@define-color error_color #df382c;

/* theme common colors */
@define-color button_bg_color shade (@bg_color, 1.02); /*shade (#cdcdcd, 1.08);*/
@define-color notebook_button_bg_color shade (@bg_color, 1.02);
@define-color button_insensitive_bg_color mix (@button_bg_color, @bg_color, 0.6);
@define-color dark_bg_color #dfd7cf;
@define-color dark_fg_color @fg_color;

@define-color backdrop_fg_color mix (@bg_color, @fg_color, 0.8);
@define-color backdrop_text_color mix (@base_color, @text_color, 0.8);
@define-color backdrop_dark_fg_color mix (@dark_bg_color, @dark_fg_color, 0.75);
@define-color backdrop_selected_bg_color shade (@bg_color, 0.92);
@define-color backdrop_selected_fg_color @fg_color;
@define-color backdrop_filling_bg #b0b0b0;

@define-color focus_color alpha (@selected_bg_color, 0.5);
@define-color focus_bg_color alpha (@selected_bg_color, 0.1);

@define-color shadow_color alpha(black, 0.5);

@define-color osd_fg_color #eeeeec;
@define-color osd_bg_color alpha(#202526, 0.7);
@define-color osd_border_color alpha(black, 0.7);

@define-color scrollbar_track_color mix(@base_color, black, 0.1); /* #e6e6e6 */

@import url("gtk-widgets-borders.css");
@import url("gtk-widgets-borders-radiance.css");
@import url("gtk-widgets-assets.css");
@import url("gtk-widgets-assets-radiance.css");
@import url("gtk-widgets.css");
@import url("gtk-widgets-radiance.css");
@import url("apps/unity.css");
@import url("apps/unity-greeter.css");
@import url("apps/baobab.css");
@import url("apps/gedit.css");
@import url("apps/nautilus.css");
@import url("apps/gnome-panel.css");
@import url("apps/gnome-terminal.css");
@import url("apps/gnome-system-log.css");
@import url("apps/glade.css");
@import url("apps/software-center.css");
@import url("public-colors.css");