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/usr/lib/python3/dist-packages/ginga/gtk3w/gtk_css is in python3-ginga 2.6.1-2.

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/*
 CSS for styling Gtk3 widgets
 */

/*
 under some themes, toggle buttons don't have any border, are
 crammed together too closely, and don't show any difference
 when they are checked or not.
 */
 
GtkToggleButton {
    border: 1px solid shade (@theme_bg_color, 0.9) ;
    padding: 4px;
}

GtkToolbar GtkToggleButton:checked {
    background-color: shade (@theme_bg_color, 0.9);
}