@Karellen, I had a look at the code for the scramblled eBook. The following code will work much better then what's therefor your back cover.
CSS
Code:
html {
margin-right: -45px;
margin-left: -45px;
break-inside: avoid !important;
}
body {
widows: 1;
orphans: 1;
margin-top: 0;
margin-right: 0;
margin-bottom: 0;
margin-left: 0;
text-align: justify;
}
img {
max-height: 100%;
max-width: 100%;
}
p {
margin-top: 0;
margin-bottom: 0;
text-indent: 1.2em;
}
.cover {
text-align: center;
text-indent: 0;
height: 100%;
}
back_cover.xhtml
Code:
<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" lang="en" xml:lang="en">
<head>
<title>Scrambled</title>
<link rel="stylesheet" type="text/css" href="stylesheet.css"/>
</head>
<body>
<div class="cover">
<img alt="" class="cover" src="back.jpg"/>
</div>
</body>
</html>