I've read many times AGPL3 (http://www.gnu.org/licenses/agpl-3.0.html) but I have a question, maybe somebody with a deeper knowledge can clarify me something.
I would like to use a source code which has this AGPL3, and I'd like to add a layout over it (new design, I'm meaning just to design, CSS, markup). I'm not referring to new features in backend, just the visual.
In this case, do I have to share all that visual work within the source code?