This file is indexed.

/usr/share/themes/Blue-Submarine/gtk-3.0/gnome-applications.css is in mate-themes 3.22.16-4ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* forward/back buttons */
.nautilus-window > headerbar.titlebar > .linked.raised > button.image-button:disabled {
     box-shadow: none;
     border-width: 1px;
}

.nautilus-window > headerbar.titlebar > .linked.raised > button.image-button:first-child {
     border-radius: 4px 0px 0px 4px;
}

.nautilus-window > headerbar.titlebar > .linked.raised > button.image-button:last-child {
     border-radius: 0px 4px 4px 0px;
}

/*************
 * rhythmbox *
 *************/

toolbar.primary-toolbar.horizontal > toolitem > grid.horizontal > button.scale.flat,
toolbar.primary-toolbar.horizontal > toolitem > grid.horizontal > button.scale.flat:hover,
toolbar.primary-toolbar.horizontal > toolitem > grid.horizontal > button.scale.flat:hover:active {
	padding: 0px 8px;
}

/* gnome-weather */
#weather-page {
    padding: 0px;
    margin: -2px -2px -2px 0px;
}

#weather-page > frame {
    border-radius: 0px;
    margin: 0px 0px 0px -1px;
    border-color: transparent;
}

#weather-page stack > scrolledwindow > .frame {
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                                      alpha(shade(@theme_selected_bg_color, 1.2), 0.1),
                                      alpha(shade(@theme_selected_bg_color, 0.95), 0.1));
    border-color: @osd_button_border;
}

#weather-page frame.weather-clear stack > scrolledwindow > .frame {
    color: @theme_fg_color;
    text-shadow: none;
}

#weather-page frame.weather-few-clouds-night .linked.stack-switcher.osd > button:checked,
#weather-page frame.weather-few-clouds-night stack > scrolledwindow > .frame label,
#weather-page frame.weather-clear-night .linked.stack-switcher.osd > button:checked,
#weather-page frame.weather-clear-night stack > scrolledwindow > .frame label,
#weather-page frame.weather-storm .linked.stack-switcher.osd > button:checked,
#weather-page frame.weather-storm stack > scrolledwindow > .frame label,
#weather-page frame.weather-showers .linked.stack-switcher.osd > button:checked,
#weather-page frame.weather-showers stack > scrolledwindow > .frame label,
#weather-page frame.weather-overcast .linked.stack-switcher.osd > button:checked,
#weather-page frame.weather-overcast stack > scrolledwindow > .frame label {
    color: @osd_button_fg_hover;
}

/****************
 * dconf-editor *
 ****************/

window.background.dconf-editor popover.menu {
    background-color: @bg_dark_color;
    background: @bg_dark_color;
}

/* the slash */
.dconf-editor headerbar.titlebar .pathbar {
    color: @menu_fg_dark_color;
}

.dconf-editor .properties-list row.activatable:hover {
    background-image: none;
    box-shadow: none;
    border-radius: 0px;
}

/*********
 * gedit *
 *********/

.gedit-side-panel-paned.horizontal > box.vertical > statusbar.horizontal {
    padding: 4px;
}