I am new user of Zoho and using it for building couple of dynamic websites. I have been using one of the pre-installed themes.  It is awesome work done by you guys to quickly develop and launch your website.  However I want to move further and do couple of customization on my website. I am wondering how can I achieve following if at all possible. (FYI: I bought Pro version of Zoho Sites).

1. Can I change background of "sidebar"? I want to put an image and want to change its color.  Deep theme customization as in wordpress seems missing or may be I am lacking bit in knowledge of using Zoho.

2. My website will be "eventually" community website. So would love to introduce login module.  How to?

3. Is there anyway I can access all HTML/CSS files of theme that is being used on my website so that I can customize as per my need?

I have tried searching these questions in forum, but did not find exact answer to my questions. If these are already answered, please point me their.  I will highly appreciate any kind of help in this regard.

Again let me tell you very frankly its awesome efforts you guy have put together to make lives of non-technical developers easy :-)

Cheers