I posted before on a CMS but I figured this might make more sense as to what I am looking for.

Currently I have a site that is in HTML format. I want to add a CMS to this site only on certain sections of each page. For example, I would like my clients to edit only one paragraph on the "About" page.

Is there a CMS that I can incorporate into my site?

Is there one where I can put in div tags? For example:

<div class="CMS"> All Editable Content is here </div>

I appreciate anyone's help!