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Gtk 3.20
Overall window style
#XfceNotifyWindow .osd
(e.g. background-color, color, border)
Window with mouse-focus
#XfceNotifyWindow .osd:hover
Summary
#XfceNotifyWindow.osd label#summary
Body
#XfceNotifyWindow.osd label#body
Button
#XfceNotifyWindow.osd button
Progressbar
#XfceNotifyWindow.osd progressbar
#XfceNotifyWindow.osd progressbar progress
#XfceNotifyWindow.osd progressbar trough