[JSWolf]

This is better CSS code. If I could see the eBook, then I could probably remove a number of classes from the CSS. It's rather poor CSS (overall). Oh and for most paragraphs, you can remove whatever clasas is most used for <p> as <p> is defined to not need such.

body {
  widows: 1;
  orphans: 1;
  margin-top: 0;
  margin-right: 0;
  margin-bottom: 0;
  margin-left: 0;
  text-align: justify;
}
p {
  margin-top: 0;
  margin-bottom: 0;
  text-indent: 1.2em
}
.c1 {
  color: #009;
  text-decoration: underline;
}
.c2 {
  font-style: normal;
}
.c3 {
  font-style: italic;
}
.c4 {
  font-style: normal;
}
.c5 {
  font-style: italic;
  text-decoration: underline;
}
.c6 {
  font-weight: normal;
}
.c7 {
  font-style: italic;
  font-weight: normal;
}
.calibre {
  display: block;
  font-family: "book antiqua";
  font-size: 1.3em;
  padding-left: 0;
  padding-right: 0;
  margin: 0;
}
.s {
  font-size: 1.6em;
  text-align: center;
  text-indent: 0;
  margin: 0;
}
.s1 {
  text-indent: 0;
  margin: 0;
}
.s2 {
  text-align: center;
  text-indent: 0;
  margin: 0 0 1.3%;
}
.s3 {
  text-align: center;
  text-indent: 0;
  margin: 0;
}
.s4 {
  font-size: 1.3em;
  text-align: center;
  text-indent: 0;
  margin: 0;
}
.s7 {
  display: block;
  font-family: "Baskerville";
  text-align: center;
  text-indent: 0;
  white-space: normal;
  margin: 0 0 1.3;
}
.s9 {
  font-size: 1.5em;
  text-align: center;
  text-indent: 0;
  margin: 0;
}
.s10 {
  text-indent: 1.2em;
  margin: 0;
}
.s11 {
  text-indent: 1.2em;
  margin: 0;
}
.s12 {
  text-align: center;
  text-indent: 1.2em;
  margin: 0;
}
.s13 {
  text-indent: 1.2em;
  margin: 0;
}
.s14 {
  text-indent: 1.2em;
  margin: 0;
}
.s15 {
  text-indent: 1.2em;
  margin: 0;
}
.s16 {
  text-indent: 0;
  margin: 0;
}