Using version 2013.2

This is how a vanilla igCombo looks on my site ... no border and can blend in with the background

My goal is to add a border around the outside edge of the list to make it stand out a bit more. I assume ui-igcombo-list is the class I would use apply border settings to the list itself (not the items), but any attempt I have made either does nothing or applies a border to all items in the list.