The worst UI ever.
 

I decided to try out Teal, and It came with the worst UI ever. It's very transparent and I can't change the opaqueness, as well as no way to change to a different UI. Anyone have tips on this?

Something to help as an example.

Right click the main chat window
1) Window -> Background -> Texture
2) Window -> Background -> Tint color -> Set to Black
3) Window -> Alpha -> Normal Level -> Set it to something like 88
4) Window -> Alpha -> Faded Level -> Set it to something like 88

Enjoy!

I hope that helps you. You may need to play around with the alpha levels. It's not perfect but it's a little better thank the standard alpha. You can also change the tint color if you like, but I found that Black works well.