Shoutbox

Ok the "????" is :

Where is located and coded this white-bar-with-gradient element ? I'd like to make its color consistent with the colors of all other elements.

I could manage to get to the code lines that give the color just above this bar, but now I'm stuck with this one...
(btw thanks to the plus! skin tool to point to .txt and element ids!!)

I can even make a color map of the elements I've changed if someone think it's useful    (yes I know, my screenshot is ugly )