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

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 #EDEDED;
@define-color fg_color #202020;
@define-color base_color #ffffff;
@define-color text_color #444;
@define-color selected_bg_color #A9B7C4;
@define-color selected_fg_color #333333;
@define-color tooltip_bg_color #D6DCE4;
@define-color tooltip_fg_color #222222;

/* 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 #4d75bf;
@define-color error_color #cc0000;

/* theme common colors */
@define-color button_bg_color shade (#cdcdcd, 1.06);
@define-color button_insensitive_bg_color mix (@button_bg_color, @bg_color, 0.6);
@define-color dark_bg_color #303334;
@define-color dark_fg_color mix (@fg_color, #efffff, 0.7);
@define-color transparent rgba (0, 0, 0, 0);

@import url("gtk-widgets.css");