You can either give each paragraph a special class with appropriate formatting, or use a little more technical CSS styling and it will do it automatically.
Code:
.noind {text-indent:0}
<p class="noind">This is a no indent paragraph.</p>
Or
Code:
.sectionbreak {margin:2em auto; text-align:center}
h2 + p, p.sectionbreak + p {text-indent:0}
Where the first paragraph which immediately follows an h2 tag,
or a paragraph defined as a section break,
will have an indent of 0
As in:
<h2>Chapter 69</h2>
<p>This is a no indent paragraph.</p>
<p class="sectionbreak">* * *</p>
<p>This is a no indent paragraph.</p>
I hope that helps!
Cheers,