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/usr/share/themes/Ozone3/gtk-3.0/gtk.css is in lubuntu-artwork-12-04 0.45.

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

The actual contents of the file can be viewed below.

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/* Ozone3 theme for Lubuntu 12.04 (GPL2) by 神癒礁湖 (Rafael Laguna) */

/* default color scheme */
@define-color bg_color #e0e0e0;
@define-color fg_color #333;
@define-color base_color #fff;
@define-color text_color #333;
@define-color selected_bg_color #8FB2CF;
@define-color selected_fg_color #fff;
@define-color tooltip_bg_color #333;
@define-color tooltip_fg_color #fff;

/* misc colors used by gtk+ */
@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 (166, 38, 38);
@define-color error_bg_color rgb (237, 54, 54);
@define-color link_color #4a90d9;
@define-color error_color #cc0000;

/* theme common colors */
@define-color 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 @bg_color;
@define-color dark_fg_color @fg_color;
@define-color transparent rgba (0, 0, 0, 0);
@define-color backdrop_selected_bg_color shade (@bg_color, 0.92);
@define-color backdrop_selected_fg_color @fg_color;

@define-color toolbar_base #e0e0e0;
@define-color toolbar_final #bcbcbc;
@define-color toolbar_border #fff;

@import url("gtk-widgets.css");
@import url("gtk-widgets-backdrop.css");
@import url("apps/gnome-panel.css");
@import url("apps/gnome-terminal.css");
@import url("apps/nautilus.css");
@import url("apps/unity.css");