numix-gtk-theme/gtk-3.0/gtk.css

/* Default color scheme */
@define-color bg_color #dedede;
@define-color fg_color #555555;
@define-color base_color #f9f9f9;
@define-color text_color #333333;
@define-color selected_bg_color #d64937;
@define-color selected_fg_color #f9f9f9;
@define-color tooltip_bg_color #2d2d2d;
@define-color tooltip_fg_color #dedede;

/* 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 (58, 135, 173);
@define-color info_bg_color rgb (217, 237, 247);
@define-color warning_fg_color rgb (192, 152, 83);
@define-color warning_bg_color rgb (252, 248, 227);
@define-color question_fg_color rgb (214, 73, 55);
@define-color question_bg_color rgb (252, 229, 213);
@define-color error_fg_color rgb (185, 74, 72);
@define-color error_bg_color rgb (242, 222, 222);
@define-color link_color #fc6f5d;
@define-color success_color #53a93f;
@define-color warning_color #f57900;
@define-color error_color #cc0000;

/* widget colors */
@define-color menubar_bg_color #2d2d2d;
@define-color menubar_fg_color #dcdcdc;
@define-color toolbar_bg_color #dedede;
@define-color toolbar_fg_color #555555;
@define-color menu_bg_color #2d2d2d;
@define-color menu_fg_color #dcdcdc;
@define-color panel_bg_color #2d2d2d;
@define-color panel_fg_color #dcdcdc;

/* osd */
@define-color osd_base #2d2d2d;
@define-color osd_fg #dcdcdc;
@define-color osd_bg alpha(@osd_base, 0.8);

/* window manager colors */
@define-color wm_bg #2d2d2d;
@define-color wm_title_focused #dcdcdc;
@define-color wm_title_unfocused #888888;
@define-color wm_border_focused #484848;
@define-color wm_border_unfocused #393939;

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