THis is the data at the top of all the sectionxxxx.html files:
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta content="OpenOffice.org 3.0 (Win32)" name="GENERATOR" />
<meta content="0;0" name="CREATED" />
<meta content="20100805;22515900" name="CHANGED" />
<style type="text/css">
/*<![CDATA[*/
<!--
@page { margin: 2cm }
P { margin-bottom: 0.21cm }
H1 { margin-bottom: 0.21cm }
H1.western { font-family: "Arial", sans-serif; font-size: 16pt }
H1.cjk { font-family: "Lucida Sans Unicode"; font-size: 16pt }
H1.ctl { font-family: "Tahoma"; font-size: 16pt }
H2 { margin-bottom: 0.21cm }
H2.western { font-family: "Arial", sans-serif; font-size: 14pt; font-style: italic }
H2.cjk { font-size: 14pt; font-style: italic }
H2.ctl { font-size: 14pt; font-style: italic }
H3 { margin-bottom: 0.21cm }
H3.western { font-family: "Arial", sans-serif }
-->
h3.sgc-3 {text-align: left}
h2.sgc-2 {text-align: center}
h1.sgc-1 {text-align: center}
/*]]>*/
</style>
</head>
<body dir="ltr" style="" xml:lang="en-US" xmlns:xml="http://www.w3.org/XML/1998/namespace">
<h3 class="western sgc-3" id="heading_id_4" style="text-align: center;">Chapter One</h3>
<p>In the dark a child was crying.</p>
It has a margin setting but surely it's commented out?
I can't find a file with css in it.