Using Xubuntu 18.04 with Greybird theme, and all the GTK 3 GtkTreeViews have all the rows white (gnome-system-monitor is one example). I would like to make the odd numbered rows a different background color, so that the treeviews are "zebra striped" / alternating row colors. What to put in ~/.config/gtk-3.0/gtk.css to achieve this?
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