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/usr/share/themes/Bluebird/gtk-3.0/gtk.css is in shimmer-themes 1.3.0-0ubuntu1.

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The actual contents of the file can be viewed below.

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/* 
	AUTHOR: Simon Steinbeiß
	BASED ON zukitwo BY lassekongo83
	LICENSE: GPL
	DESCRIPTION: A port of Bluebird to gtk3.
*/

/* default color scheme */
@define-color bg_color #DCDCDC;
@define-color fg_color #3c3c3c;
@define-color base_color #F7F7F7;
@define-color text_color #3c3c3c;
@define-color selected_bg_color #7E9EBD;
@define-color selected_fg_color #f5f5f5;
@define-color tooltip_bg_color #000000;
@define-color tooltip_fg_color #FFFFFF;

/* misc colors used by gtk+ */
@define-color link_color #08c;
@define-color warning_color #f57900;
@define-color error_color #cc0000;
@define-color success_color #4e9a06;

/* 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 #686868;
@define-color dark_fg_color #FFF;
@define-color transparent rgba (0, 0, 0, 0);

@define-color internal_element_color #afafaf;
@define-color insensitive_bg_color #f5f5f5;
@define-color insensitive_fg_color #a7a7a7;
@define-color insensitive_border_color shade (@internal_element_color, 1.37);
@define-color inactive_frame_color #c8c8c8;
@define-color inactive_frame_border_a #8b8b8b;
@define-color inactive_frame_border_b #c6c6c6;

@define-color trough_bg_color_a #efefef;
@define-color trough_bg_color_b #e0e0e0;

@define-color toolbar_gradient_base #cecece;
@define-color toolbar_gradient_final #c4c4c4;
@define-color toolbar_border #c4c4c4;

@define-color button_gradient_color_a shade (@button_bg_color,1.1);
@define-color button_gradient_color_b shade (@button_bg_color,0.95);
@define-color button_hover_gradient_color_a mix (@bg_color, shade (@selected_bg_color,1.4),0.7);
@define-color button_hover_gradient_color_b mix (@bg_color, shade (@selected_bg_color,1.25),0.5);
@define-color button_active_gradient_color_a shade (@button_gradient_color_b, 0.80);
@define-color button_active_gradient_color_b shade (@button_gradient_color_a, 0.80);

@define-color progressbar_through_a #c7c7c7;
@define-color progressbar_through_b #d7d7d7;
@define-color progressbar_through_border #a3a3a3;
@define-color progressbar_background_a #a2b8cb;
@define-color progressbar_background_b #b5c8d7;
@define-color progressbar_border #8298aa;

@define-color menuitem_background_a #8ba4b8;
@define-color menuitem_background_b #7a94a9;

/* User defined for this theme */
@define-color border_color_a #afafaf;
@define-color border_color_b #7a7a7a;
@define-color scrollslider_gradient_a #d8d8d8;
@define-color scrollslider_gradient_b #bdbdbd;
@define-color scrollslider_border #9a9a9a;
@define-color listview_header_gradient_a #ececec;
@define-color listview_header_gradient_b #d8d8d8;
@define-color listview_border #cbcbcb;
@define-color sidebar_color mix (@bg_color,shade (@selected_bg_color,1.35),0.8);
/* End user defined for this theme */

@import url("gtk-widgets.css");
/*@import url("gtk-buttons.css");
@import url("gtk-frames.css");
@import url("gtk-bars.css");
@import url("gtk-menus.css");
@import url("gtk-misc.css");*/