Customize BnetChat/channel

Hello guys! I'm new here, I'm really sorry If i opened my topic in wrong section, I'm lost..
I'm trying to customize my warcraft for days now and I can't find the last thing a really need.
Please could someone help me?

The situation:
I'm done with almost everything, BUT I can't find / don't know what to change or add to make my channel (chat) same as the inbox where I write the chat message.
You see my background is white and it's hard to read anything if there is no "shade".
Same goes for users on channel / friendlist.
I tried everything, I'm a freankin noob -_-.

Please help me, here is what it looks like now:

http://i39.tinypic.com/25plmci.jpg

And sorry if i posted my question to wrong section. Thank you for your assistance!

I don't have much (or any, really) experience with bnet UI editing, but couldn't you just modify the image you use as your background to have a darker rectangle where the chat text is?