Pagination's .active in well has wrong background color

Created by: AviDuda

If I have the pagination inside .well, then .active class has background-color set to #f5f5f5 (which is default the same as well's background color), so it isn't much noticeable what is the active page. Variable would be great for it, default #eee or similar color would be good. Tested in 2.0.4, but I see that CSS isn't changed in 2.1.0.