Popup Menu New Item/Alert Background?

[Wing]

Been spending way too long trying to figure out the CSS for this one. We desire that whenever a new ALERT/NEW item is presented to the user, the background-color of that item in the popup menu changes to a different color as opposed to the grey of all other items within the popup. Can someone direct me to the proper CSS target for this? Thanks!


(As you can see here, all items show grey background regardless if new alert or not).
Popup Menu New Item/Alert Background?

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