Need CSS specs for Activ compiler

I would like to know what kind of CSS Activ compiler can handle. I will be writing my own html code.
In particular I am interested how to set up text margins and whether it is possible to set padding for some box containers.
I tried to set up margins in <P> and <H?> tags, but it did not work.
Word97, for example, does NOT generate any formatting info in "Save As" HTML mode. I wasn't planning to use it, just to check which capabilities it has, since it is mentioned in the Activ specs

As one can well imagine, if the text is spread out over the entire screen width, it is pretty much unreadable.
Is there a single resource on this forum or elsewhere, which is as close to the formal CSS specs as possible?

I submitted this question by email, as I did not know there is a forum for this compiler, but if someone else would benefit from this info, so much better.

Activ E-Book will handle anything that will work in Microsoft Internet Explorer including HTML, CSS, Javascript, etc.

If you write a valid HTML page that will display in Internet Explorer -- then you can use that page in your Activ eBook. This includes layers "<div>", all valid HTML tags, frames, iframes etc. and both inline CSS and CSS style sheets.

I personally use Dreamweaver to construct my HTML web pages for Activ E-Book but I've also used the "CoffeeCup" editor and sometimes a plain TEXT editor like notepad.

MS Word is not a particularly good program to build an HTML file with because it adds proprietary code to the document that might not work properly as an HTML file.