There are a few blue fonts of various sizes in the EVO template. Which one(s) to you wish to change?
If the blue colour is used in other templates as well, the font colour is more likely to be in templates/base/css in the general or common css files there.
The Evo css files of the same name are what are referred to as override files and they change certain things just for the Evo template only.
So, always look there first, then look in templates/Base/CSS. Instead of making changes there, copy the code to the EVO css files and change it there. That code will then override the Base template CSS which will stay intact for other templates.
Hope that makes sense.