body {
    margin-left: 20%
    margin-right: 20%
}
.coverPage {
    border: 1px solid #dddddd;
    border-radius: 6px;
    padding-top: 15px;
    padding-bottom: 15px;
    padding-left: 50px;
    margin: 20px;
}
.coverTOC {
    border: 1px solid #dddddd;
    border-radius: 6px;
    font-size: 1.8em;
    padding-left: 50px;
    padding-top: 20px;
    padding-bottom: 20px;
    margin: 20px;
}
.mainTitle {
    font-size: 4em;
    font-weight: bold;
    font-family: sans-serif;
    padding-bottom: 5px;
}
.subTitle {
    font-size: 2.4em;
    font-weight: bold;
    font-family: sans-serif;
    padding-bottom: 30px;
}
.author {
    font-size: 1.7em;
    font-family: sans-serif;
}
.isbn {
    font-size: 0.9em;
    margin-top: 5px;
    font-family: sans-serif;
}
.partDescription {
    font-size: 0.8em;
    font-family: sans-serif;
    margin-left: 5%;
    margin-bottom: 8px;
}
.copyright {
    font-size: 0.9em;
    font-family: sans-serif;
    margin-left: 20px;
}
.twitter {
    font-size: 0.9em;
    font-family: sans-serif;
    margin-right: 20px;
}
.halfline {
    content: " ";
    display: block;
    margin-bottom: 12px;
}