In the affected book it's the following
Code:
<body class="level">
<h1 class="ch">34</h1>
<p class="calibre6">
The two classes are
Code:
.level {
-moz-hyphens: auto;
-webkit-hyphens: auto;
adobe-hyphenate: none;
display: block;
font-size: 1em;
hyphens: auto;
orphans: 2;
padding-left: 0;
padding-right: 0;
text-align: justify;
widows: 2;
margin: 0
}
Code:
.ch {
-moz-hyphens: none;
-webkit-hyphens: none;
adobe-hyphenate: none;
display: block;
font-size: 1.66667em;
font-weight: bold;
hyphens: none;
text-align: center;
text-indent: 0;
margin: 1.5em 0 3em
}