For reasons now obscure, I use H2 for chapter headings. Here's the CSS, which I've never seen to fail:
h2 {
margin-top:1em;
font-size: 150%;
text-indent: 0em;
font-style: italic;
text-align:center;
}
As others have said, that obviates the need for any styling in the <h2> tag itself.
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