This file is indexed.

/usr/share/themes/TraditionalOk/gtk-3.0/mate-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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/************
 * Caja *
 ************/

/* caja sidebar */
/* all sidebars */
.caja-side-pane treeview.view,
.caja-side-pane textview.view text,
.caja-side-pane viewport.frame,
.caja-side-pane widget .vertical {
    background-color: shade (@theme_base_color, 1.00);
    color: @theme_fg_color;
}

/* move whole the frame, to free eject button for overlay scrollbars */
.caja-side-pane scrolledwindow.frame {
    padding: 0px;
    margin: 0px 0px 0px -8px;
}

.caja-side-pane scrolledwindow.frame treeview.view {
    padding: 3px 0px 3px 0px;
}

/* better for overlay scrollbars */
/* to avoid overlap with eject buttons */
.caja-side-pane scrolledwindow scrollbar.vertical.right.overlay-indicator,
.caja-side-pane scrolledwindow scrollbar.vertical.right.overlay-indicator trough,
.caja-side-pane scrolledwindow scrollbar.vertical.right.overlay-indicator slider,
.caja-side-pane scrolledwindow scrollbar.vertical.right.overlay-indicator button {
    min-width: 13px;
}

/* ComboBox views */
.caja-navigation-window toolbar.primary-toolbar combobox button.combo {
    padding: 5px;
    border-image: none;
}

.caja-navigation-window toolbar.primary-toolbar combobox button.combo:hover {
    padding: 5px;
    box-shadow: none;
}

.caja-canvas-item {
    border-radius: 3px;
}

/* EelEditableLabel (icon labels) */
.caja-navigation-window .view .entry,
.caja-navigation-window .view .entry:focus,
.caja-desktop widget.entry,
.caja-desktop widget.entry:focus {
   border-image: none;
   border-style: solid;
   border-width: 1px;
   border-color: @theme_fg_color;
   box-shadow: none;
   border-radius: 3px;
   text-shadow: none;
   background-image: -gtk-gradient(linear,
                                   left top, left bottom,
                                   from       (shade(@theme_base_color, 0.86)),
                                   color-stop (0.15, shade(@theme_base_color, 0.96)),
                                   color-stop (0.50, shade(@theme_base_color, 0.98)),
                                   to         (shade(@theme_base_color, 1.00)));
}

/* desktop */
.caja-desktop.caja-canvas-item {
    color: @theme_base_color;
    text-shadow: 1px 1px alpha (@theme_fg_color, 0.8);
}

.caja-desktop.caja-canvas-item:active,
.caja-desktop.caja-canvas-item:hover,
.caja-desktop.caja-canvas-item:selected {
    text-shadow: none;
}

/* view */
.caja-navigation-window .view.caja-canvas-item {
    color: @theme_fg_color;
}

.caja-navigation-window .view.caja-canvas-item:selected {
    color: @theme_selected_fg_color;
}

/***************
 * mate-panel *
 ***************/

.mate-panel-menu-bar {
    background-color: @theme_bg_color;
    padding: 0px;
    color: @theme_fg_color;
    text-shadow: none;
}

MatePanelAppletFrameDBus > MatePanelAppletFrameDBus {
    background-image: -gtk-scaled(url("img/panel-grid.svg"));
    background-color: transparent;
    background-repeat: no-repeat;
    background-position: left;
}

/* workaround to avoid unwanted black frames if switching compositor on/off */
.mate-panel-menu-bar .window-frame.csd.popup {
    box-shadow: none;
}

/* hide buttons */
PanelToplevel > grid > button {
    padding: 0px;
    border-radius: 0px;
}

#PanelApplet {
    border-width: 0;
}

PanelSeparator {
    border-width: 0;
    background-image: none;
    color: shade (@theme_bg_color, 0.75);
    text-shadow: none;
}

/* outlines */
window.background, /* selector where outlines are writen on GtkTrayIcon */
.mate-panel-menu-bar menubar,
.mate-panel-menu-bar PanelApplet,
.mate-panel-menu-bar button,
#PanelApplet > #clock-applet-button.flat.toggle,
#PanelApplet > #showdesktop-button,
#PanelApplet > wnck-tasklist > button,
PanelApplet.wnck-applet .wnck-pager {
    outline-offset: -2px;
    outline-style: solid;
    outline-color: shade (@theme_selected_bg_color, 0.8);
    outline-width: 2px;
}

.mate-panel-menu-bar button {
    -gtk-outline-radius: 3px;
    box-shadow: none;
    border-image: none;
}

/* main menu */
/* set normal menubar button */
.mate-panel-menu-bar menubar {
    padding: 0px;
    background-image: none;
}

/* all applets */
.mate-panel-menu-bar #PanelApplet button,
.mate-panel-menu-bar #PanelApplet button.flat,
.mate-panel-menu-bar #PanelApplet button.toggle,
.mate-panel-menu-bar #PanelApplet button.flat.toggle {
    padding: 4px;
    border-radius: 3px;
    border-width: 1px;
    border-style: solid;
    text-shadow: none;
    border-color: @border_color;
    color: @theme_fg_color;
    background-color: transparent;
    background-image: -gtk-gradient (linear,
                      left top,
                      left bottom,
                      from (@button_gradient_a),
                      to (@button_gradient_d));
}

.mate-panel-menu-bar #PanelApplet button:checked,
.mate-panel-menu-bar #PanelApplet button:checked:hover,
.mate-panel-menu-bar #PanelApplet button:hover:active,
.mate-panel-menu-bar #PanelApplet button.flat:checked,
.mate-panel-menu-bar #PanelApplet button.flat:checked:hover,
.mate-panel-menu-bar #PanelApplet button.flat:hover:active,
.mate-panel-menu-bar #PanelApplet button.toggle:checked,
.mate-panel-menu-bar #PanelApplet button.toggle:checked:hover,
.mate-panel-menu-bar #PanelApplet button.toggle:hover:active,
.mate-panel-menu-bar #PanelApplet button.flat.toggle:checked,
.mate-panel-menu-bar #PanelApplet button.flat.toggle:checked:hover,
.mate-panel-menu-bar #PanelApplet button.flat.toggle:hover:active {
    border-style: solid;
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @button_active_gradient_a,
                      @button_active_gradient_b 3px,
                      @button_active_gradient_c 4px,
                      @button_active_gradient_d 50%,
                      @button_active_gradient_e 50%,
                      @button_active_gradient_f);
}

.mate-panel-menu-bar #PanelApplet button:hover,
.mate-panel-menu-bar #PanelApplet button.flat:hover,
.mate-panel-menu-bar #PanelApplet button.toggle:hover,
.mate-panel-menu-bar #PanelApplet button.flat.toggle:hover {
    border-style: solid;
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @button_hover_gradient_a 5%,
                      @button_hover_gradient_b 95%,
                      @button_hover_gradient_c);
}

/* use only outlines if focused */
.mate-panel-menu-bar #PanelApplet button:focus {
    box-shadow: none;
    border-image: none;
}

/* 1.18 changings for gtk+-3.22 warning fixes*/
.mate-panel-menu-bar #PanelApplet #drive-button,
.mate-panel-menu-bar #PanelApplet #drive-button:hover,
.mate-panel-menu-bar #PanelApplet #charpick-applet-button,
.mate-panel-menu-bar #PanelApplet #showdesktop-button:checked {
    border-image: url("img/border.svg") 3 3 4 3 / 3px 3px 4px 3px repeat;
    border-width: 0px;
}

#PanelApplet > #clock-applet-button.flat.toggle {
   background-color: transparent;
   background-image: none;
   border-color: transparent;
}

#PanelApplet > #clock-applet-button.flat.toggle:hover {
    border-style: solid;
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @button_hover_gradient_a 5%,
                      @button_hover_gradient_b 95%,
                      @button_hover_gradient_c);
}

#PanelApplet > #clock-applet-button.flat.toggle:checked {
    border-style: solid;
    border-color: @border_color;
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @button_active_gradient_a,
                      @button_active_gradient_b 3px,
                      @button_active_gradient_c 4px,
                      @button_active_gradient_d 50%,
                      @button_active_gradient_e 50%,
                      @button_active_gradient_f);
}

#PanelApplet > #clock-applet-button.flat.toggle:checked:hover {
    border-image: none;
}

/* use only outlines if focused */
#PanelApplet > #clock-applet-button.flat.toggle:focus {
    box-shadow: none;
    border-image: none;
}


#clock-applet-button.flat.toggle > box.horizontal > label {
    font-weight: normal;
}

/* calendar window */
#MatePanelPopupWindow {
	border-radius: 3px;
}

#MatePanelPopupWindow expander {
	border-style: none;
}

/* Weird, this sets the border color of the clockmap */
#MatePanelPopupWindow > frame > box > box > box > widget {
    color: @border_color;
}

PanelApplet.wnck-applet .wnck-pager {
    background-image: none;
    color: shade (@theme_selected_bg_color, 1.30);
    background-color: transparent;
    text-shadow: none;
}

/* selected WnckPager */
PanelApplet.wnck-applet .wnck-pager:selected {
    background-image: linear-gradient(to bottom,
        shade (@theme_selected_bg_color, 0.8),
        shade (@theme_selected_bg_color, 1.06));
}

/* hover of WnckPager */
PanelApplet.wnck-applet .wnck-pager:hover {
    background-image: linear-gradient(to bottom,
        shade (@theme_selected_bg_color, 1.86),
        shade (@theme_selected_bg_color, 1.0));
}

/* Classic icon style */
.mate-panel-menu-bar {
    -PanelMenuBar-icon-visible: true;
}

na-tray-applet {
    background-image: none;
    background-color: transparent;
    padding: 0;
    text-shadow: none;
    -NaTrayApplet-icon-padding: 1px; /*any more and outlines get cut off*/
}

/* volume applet, brightness applet */
.mate-panel-applet-slider {
    background: transparent;
}

.mate-panel-applet-slider frame {
    background-color: @theme_bg_color;
    border-image: none;
    border-style: solid;
    border-radius:2px;
    padding: 0px;
    margin: 0px;
}

.mate-panel-applet-slider frame frame {
    background-color:transparent;
    border-style: none;
    box-shadow: none;
}

.mate-panel-applet-slider frame button {
    color: @theme_fg_color;
}

/* mate-menu, mintmenu fork */
#mate-menu.background {
    border-color: @border_color;
    border-style: solid;
    border-width: 1px;
}

/* mate-indicator-applet */
/* needed for a transparent panel */
#fast-user-switch-applet > #fast-user-switch-menubar {
    background-color: transparent;
    background-image: none;
}

/* globalmenu (vala-panel-appmenu) */
#PanelApplet > .-vala-panel-appmenu-core > scrolledwindow > viewport.frame {
    background-color: transparent;
}

#PanelApplet > .-vala-panel-appmenu-core > scrolledwindow {
    border-style: none;
}

/****************
 * Pluma *
 ****************/

/* pluma line numbers */
.pluma-window textview {
    background-color: shade (@bg_color, 1.07);
}

/* Printpreview */
.pluma-print-preview toolbar.horizontal {
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @toolbar_gradient_a 2px,
                      @toolbar_gradient_b 50%,
                      @toolbar_gradient_c 50%,
                      @toolbar_gradient_d);
    border-width: 1px 0 1px 1px;
    border-radius: 0;
    border-style: solid;
    border-top-color: @toolbar_border_top_color;
    border-bottom-color: @toolbar_border_bottom_color;
    padding: 0px;
}

.pluma-print-preview toolbar.horizontal toolitem entry {
    padding: 2px 6px;
}

.pluma-print-preview toolbar.horizontal button.image-button,
.pluma-print-preview toolbar.horizontal button.flat.image-button {
    background-color: transparent;
    padding: 0px;
}

.pluma-print-preview toolbar.horizontal toolbutton button.text-button,
.pluma-print-preview toolbar.horizontal toolbutton button.flat.text-button {
    background-color: transparent;
    padding: 0px 8px;
    border-radius: 2px;
}

/* sidebar file-browser */
.pluma-window paned.horizontal box.horizontal button.flat {
    padding: 0px;
}

.pluma-window paned.horizontal box.vertical notebook.frame {
    border-width: 1px 0px 0px 0px;
    border-style: solid;
    border-color: @border_color;
    border-radius: 0px;
}

/* sidebar close button */
.pluma-window paned.horizontal box.vertical notebook.frame toolbar button {
  padding: 4px;
}

.pluma-window paned.horizontal box.vertical notebook.frame #ToolBar toolbutton button {
    border-width: 1px 1px 2px 1px;
}

.pluma-window paned.horizontal box.vertical notebook.frame #ToolBar toolbutton button:hover {
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @button_hover_gradient_a 5%,
                      @button_hover_gradient_b 95%,
                      @button_hover_gradient_c);
    border-image: url("img/border.svg") 3 3 4 3 / 3px 3px 4px 3px repeat;
    border-radius: 3px;
    border-width: 1px 1px 2px 1px;
    border-style: solid;
}

.pluma-window paned.horizontal box.vertical notebook.frame #ToolBar toolbutton button:checked {
    background-image: linear-gradient(to bottom,
                      @button_active_gradient_a,
                      @button_active_gradient_b 3px,
                      @button_active_gradient_c 4px,
                      @button_active_gradient_d 50%,
                      @button_active_gradient_e 50%,
                      @button_active_gradient_f);
    background-color: transparent;
    border-image: url("img/border.svg") 3 3 4 3 / 3px 3px 4px 3px repeat;
    border-radius: 3px;
    border-width: 1px 1px 2px 1px;
    border-style: solid;
}

/*********
 * Atril *
 *********/

/* atril and eom */
EggToolbarEditor.vertical scrolledwindow {
    background-color: shade (@theme_base_color, 1.0);
    border-color: @border_color;
    border-width: 1px;
    border-radius: 0px;
    border-style: solid;
}

/* broken text selection */
.atril-window scrolledwindow.frame > widget:active,
.atril-window scrolledwindow.frame > widget:selected {
	background-color: @theme_selected_bg_color;
	color: @theme_selected_fg_color;
}

.lock-dialog {
    border-radius: 4px;
    border-style: solid;
    border-width: 0px;
    /* not sure if box-shadow works here */
    box-shadow: 0 0 0 1px @wm_border, 0 2px 8px 3px @wm_shadow;
}

.lock-dialog notebook {
    border-style: none;
}

/* mate-appearance-properties, UI tab */

.appearance-window > box.vertical.dialog-vbox > notebook.frame  box.vertical > box.vertical > box.horizontal > box.vertical menubar {
    border-style: solid;
    border-width: 1px 1px 0px 1px;
    border-color: darker (@theme_bg_color);
    -GtkToolbar-button-relief: normal;
    padding-left: 4px;
    padding-right: 4px;
}

.appearance-window > box.vertical.dialog-vbox > notebook.frame  box.vertical > box.vertical > box.horizontal > box.vertical toolbar {
    border-style: solid;
    border-width: 1px;
    border-color: @toolbar_border_top_color;
    background-color: transparent;
    background-image: linear-gradient(to bottom,
                      @toolbar_gradient_a 2px,
                      @toolbar_gradient_b 50%,
                      @toolbar_gradient_c 50%,
                      @toolbar_gradient_d);
}

/* multimedia OSD */
MsdOsdWindow.background.osd {
    border-radius: 20px;
    border-style: solid;
    border-width: 1px;
    border-color: rgba(0,0,0,0.6);
    background-image: linear-gradient(to bottom,
                                      @osd_toolbar_bg_a,
                                      @osd_toolbar_bg_b 63%,
                                      @osd_toolbar_bg_c);
    background-color: transparent;
}

MsdOsdWindow.background.osd .trough {
	background-color: @osd_trough_bg;
    border-radius: 3px;
    border-width: 1px;
    border-color: rgba(0,0,0,0.6);
}

MsdOsdWindow.background.osd .progressbar {
    border-width: 1px;
    border-radius: 3px;
    border-color: rgba(0,0,0,0.4);
	background-color: alpha(shade(@theme_selected_bg_color, 1.0), 0.9);
}

/*****************
 * mate-terminal *
 *****************/

/* override settings for pavu-control */
window.background.mate-terminal > box.vertical > notebook,
window.background.mate-terminal > box.vertical > notebook > stack > box {
    border-style: none;
    margin: 0px;
}

/* override settings for pavu-control */
window.background.mate-terminal > box.vertical > notebook > header.top {
    border-radius: 3px 0px 0px 0px;
    margin: 0px;
    border-style: solid;
    border-color: @theme_bg_color;
    border-width: 0px 0px 0px 0.1px;
}

window.background.mate-terminal > box.vertical > notebook > header.top tab {
    border-radius: 3px 3px 0px 0px;
    padding: 4px 2px 4px 6px;
    margin: 0px 0px 0px -1px;
    border-style: solid;
    border-color: @border_color;
    border-width: 1px;
}

window.background.mate-terminal > box.vertical > notebook > header.top tab:checked,
window.background.mate-terminal > box.vertical > notebook > header.top tab:checked:hover {
    border-radius: 3px 3px 0px 0px;
    padding: 4px 2px 4px 6px;
    margin: 0px 0px 0px -1px;
    border-style: solid;
    border-color: @border_color;
    border-top-color: @notebook_active_tab_border;
    border-left-color: @notebook_active_tab_border;
    border-right-color: @notebook_active_tab_border;
    border-width: 1px;
}

/***********************
 * mate-volume-control *
 ***********************/

/* application notebook page */
GvcMixerDialog notebook.frame scrolledwindow {
    border-style: none;
}

/* override previous setting */
GvcMixerDialog notebook.frame box scrolledwindow.frame {
    border-style: solid;
    border-color: @border_color;
    border-width: 1px;
    border-radius: 2px;
    padding: 0;
}

/***********************
 * mate-control-center *
 ***********************/

#MyControlCenter button.flat {
    outline-style: dashed;
}

/* mate-keyboard-layout-view, mate-keyboard-layout-chooser */
/* this way it styles only the border of the keys, the bg of the map itself
   use the .view class, and use old and new selectors for a while */
matekbd-keyboard-drawing,
.gswitchit-layout-view > box.dialog-vbox > box.vertical > widget,
#xkb-layout-chooser > box.dialog-vbox > box.vertical > box.vertical > frame > widget {
    background-color: shade (@theme_bg_color, 1.0);
}

#xkb-layout-chooser > box.dialog-vbox > box.vertical > box.vertical > frame > border {
    border-radius: 0px;
}

/* fix for some maximized windows 
   https://github.com/mate-desktop/mate-desktop/issues/291
   FIXME Sadly pluma ignore doesn't show the maximised style class */

window.background.maximized.engrampa-window > grid.horizontal > paned.horizontal > scrolledwindow.frame,
window.background.maximized.atril-window > box.vertical > paned.horizontal > box.vertical > scrolledwindow.frame,
window.background.pluma-window > box.vertical > paned.horizontal > paned.vertical > notebook box.vertical > scrolledwindow.frame,
window.background.maximized.logview-window > box.vertical > paned.horizontal > box.vertical > scrolledwindow.frame,
window.background.maximized.caja-navigation-window notebook.caja-notebook scrolledwindow.frame {
    border-right-width: 0px;
}