I think agentfive will have a better idea of this than me, but...
I believe the chat window doesn't have much of a border. I think it all lies on a mostly transparent background and the border is just sort of "off". The interior of the chat listbox is also a set of transparent backgrounds with opacity from 0 to 1 that we cycle between when you're adjusting the slider.
That being said, I can certainly try to get what elements are possible added to the list of ArtAssetIDs we expose.
-P
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