you lost me there.
afaik I don't have any special external style sheet. just the standard stylesheet.css file
i add a book to calibre, convert it to epub with remove blank lines set.
then I try to use the extra css function in calibre its just fill in the box & click OK
according to the calibre user manual, it's supposed to take what you put in that box & use it as override.
sigil is being used here only to view the xhtml & stylesheet in order to understand what is going on.
here is a start of xhtml file extract - same book as before
Code:
<?xml version="1.0"?>
<!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>Soul Identity</title>
<link href="../Styles/stylesheet1.css" rel="stylesheet" type="text/css" />
<style type="text/css">
@page { margin-bottom: 5.000000pt; margin-top: 5.000000pt; }
</style>
</head>
<body class="calibre5">
<div class="calibre6">
<h1 class="calibre11" id="calibre_pb_21"><span class="calibre12">ten</span></h1>
<div class="calibre13"></div>
<p class="calibre10"></p>
<p class="calibre10"><span class="calibre14"><span>It took me a</span> few seconds when I woke up to remember I was in the Soul Identity guesthouse. Val and I had climbed down the hill and returned to the office, where she wasted a few hours giving me demonstrations of her new online applications.</span></p>