HTML Help Output Para still right-aligned despite css

Hi, all.

My FM template for PDF output has a text column and side heads. My H1, H2, and H3 are right-aligned within the side head, so they look something like this:

                      HERE IS    Here is the text in the text column. blah blah b

THE GLORIOUS SIDE    blah blah blah blah blah blah blah blah blah

                    HEADING    blah blah blah blahblah blah blah blahblah

                                        blah blah blah blahblah blah blah blahblahblah

                                        blah blah blahblah blah blah blahblah

Like that. Let's say that the side heading has the H1 tag. It is right-aligned within the side heading.

I have attached a .css that has these attributes for H1:

p.H1 {

margin-left: 0.000pt;

margin-right: 0.000pt;

text-align: left;

text-indent: 0.000pt;

margin-top: 12.000pt;

margin-bottom: 4.000pt;

font-family: Arial;

font-style: normal;

font-weight: bold;

font-size: 18.0pt;

background-color: none;

letter-spacing: 0.00em;

color: #005ba8;

text-decoration: none;

It sure looks to me as if the H1 should be left-aligned in the .chm file. But it is not. It is right-aligned, as are the H2 and H3 styles.

What is overriding the css? Thanks very much.