Selection colour

Apologising in advance for what probably seems like a very silly concern (being an aesthete is a joy and a curse): how do I change the selection colour (the temporary border around a note that is only visible when the note is selected, at present a sickly ochre on my system)? I searched manual and forum in vain for instructions.

Never mind… it seems this ochre horror is a variety of my system wide yellow highlight colour, uglified for unknown reasons.