XF 1.1 Issues with thread on mouseover

I attached an image of what I'm mousing over. When I mouseover it brings up a box showing the post. My issue is that the box is transparent and has the background showing which doesn't mix well with seeing the content. Is there a way to make it non transparent?


I'll take a picture later, but the background of the content is transparent making it hard to see. The xenforo forum has a solid white background that separates it from the content behind, but mine seems to be transparent.