This file is indexed.

/usr/share/themes/BlackMATE/apps/yumex.css is in mate-themes 3.22.16-4ubuntu1.

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The actual contents of the file can be viewed below.

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/*the order of the widgets is important! */

.button,
.menu-button {
   padding: 6px;
}

column-header {
	padding: 1px 2px;
}

column-header.button,
column-header .button {
	border-image: none;
	border-width: 0px 0px 1px 1px;
	border-radius: 0;
	border-style: solid;
	border-color: @less_dark_color;
    padding: 2px;
}

.view {
    background-color: shade(@less_dark_color, 2.4);
    color: @theme_main_color;
}

/* PackageView */
GtkPaned.vertical GtkBox.horizontal .view {
    background-color: shade(@less_dark_color, 2.8);
}

GtkPaned.vertical GtkBox.vertical {
    background-image: linear-gradient(to top,
                                      @toolbar_gradient_base,
                                      @bg_color);
    border-radius: 5px 5px 0px 5px;
}

/* group view */
GtkPaned.horizontal .frame .view {
    background-color: shade(@bg_color, 0.8);
    color: @theme_fg_color;
}

GtkPaned.vertical .frame .view {
    background-color: shade(@less_dark_color, 2.4);
}

/* infobar */
GtkRevealer .frame {
    background-color: shade(@less_dark_color, 0.4);
}

GtkRevealer .frame .horizontal {
    background-color: shade(@less_dark_color, 0.6);
    border-radius: 4px;
}