Attempting to Style Selected days on a GtkCalendar (v4)

I am attempting to style selected days on the widget displayed here:

image

My stylesheet looks like this:
calendar:selected {
  background: #00cc11;
   color: #fff;
  font-weight: bold;
}
.today {
  background: #0011cc;
  color: #fff;
  font-weight: bold;
}

As you can see in the screenshot, November 17th of the current year was selected, but there is no visual style difference in the calendar widget. Can someone tell me what I am missing?

Thanks!

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