body {
    font-family: Georgia, "New Century Schoolbook", Times, serif;
    margin-left: 5ex;
    margin-right: 10ex
    }
.booktitle {
    font-size: xx-large;
    text-align: center
    }
.subtitle {
    font-size: x-large;
    text-align: center
    }
.author {
    font-size: large;
    text-align: center
    }
.publish {
    text-align: center
    }
.right {
    text-align: right
    }
.left {
    text-align: left
    }
.justify {
    text-align: justify
    }
.center {
    text-align: center
    }
p.justify {
    text-indent: 3ex
    }
img {
    display: block;
    margin-left: auto;
    margin-right: auto
    }
.toc {
    border-left: 1ex solid green;
    padding-left: 3ex;
    margin-left: 1ex
    }