Qt5 focus ring offset not working?

[DDR0]

Hello.
I'm trying to style the focus ring of my application - I'd like it to appear around my buttons, as opposed to inside them. To that extent, I am trying to style the ring like this:

app.setStyleSheet("""
	/* Remove the little dotted focus ring. It's too hard to see. */
	*:focus {
		outline: 2px double blue;
		outline-offset: 5px; /*This does not work.*/
	}
""")

The outline-offset propertyhas no effect, positive or negative. What am I doing wrong? No errors or warnings are given by the program, and the outline property works fine.

Thanks!