When you are inspecting the code using those tools, and you "click" on the taglinewrapper, you should be shown the "history" of presenting that css. Everything involved should show how that specific object has come to have the formatting that it does. This should include at least one reference to taglinewrapper and should show the filename and line number at which the assignment is located.

Or while the same is displayed, you can search the css files for that particular attribute, but one should be wary of the results especially in a responsive template because of how the css "sections" are applied. Finding and changing a definition for a small resolution will do no good for a large resolution nor affect the large resolution or vice versa, they each control their resolution's presentation...