/usr/share/themes/Blackbird/gtk-3.20/gtk.css is in blackbird-gtk-theme 0.4+20160704~ab4a30e-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | /* dark colormap */
@define-color theme_bg_color #383838;
@define-color theme_fg_color #dedede;
@define-color theme_base_color #333333;
@define-color theme_text_color #eeeeee;
@define-color theme_selected_bg_color #5588ee;
@define-color theme_selected_fg_color #ffffff;
@define-color theme_tooltip_bg_color #111111;
@define-color theme_tooltip_fg_color #dedede;
/* shadow effects */
@define-color light_shadow #444;
@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 (85, 136, 238);
@define-color error_fg_color rgb (255, 255, 255);
@define-color error_bg_color rgb (237, 54, 54);
@define-color link_color #5588ee;
@define-color link_visited_color #2a76c6;
@define-color success_color #4e9a06;
@define-color error_color #cc0000;
/* widget colors */
@define-color titlebar_bg_color @theme_bg_color;
@define-color titlebar_fg_color @theme_fg_color;
@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 @theme_bg_color;
@define-color menu_fg_color @theme_fg_color;
@define-color panel_bg_color @theme_bg_color;
@define-color panel_fg_color @theme_fg_color;
@define-color tab_checked_color #215d9c;
/* osd */
@define-color osd_base #333;
@define-color osd_fg #eee;
@define-color osd_bg alpha(@osd_base, 0.8);
/* backdrop colors */
@define-color backdrop_selected_bg_color shade (@theme_bg_color, 0.9);
@define-color backdrop_selected_fg_color @theme_fg_color;
/* window manager colors */
@define-color wm_bg @theme_bg_color;
@define-color wm_title_focused mix(@theme_fg_color, @theme_bg_color, 0.1);
@define-color wm_title_unfocused mix(@theme_fg_color, @theme_bg_color, 0.6);
@define-color wm_border_focused shade(@theme_bg_color, 0.7);
@define-color wm_border_unfocused shade(@theme_bg_color, 0.8);
@import url("gtk-widgets.css");
@import url("gtk-widgets-assets.css");
@import url("gtk-widgets-backdrop.css");
@import url("apps/gnome-applications.css");
@import url("apps/granite-widgets.css");
@import url("apps/unity.css");
@import url("apps/xfce.css");
@import url("apps/lightdm-gtk-greeter.css");
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