src/gug.css

body {

    color: black;
    background: white;

    font-family: 'FreeSans', 'Liberation Sans', 'Arial', 'Helvetica', sans-serif;
    text-align: justify;
    text-rendering: optimizeLegibility;
    line-height: 125%;

    margin: 0;
    padding: 0;

}

/* Green links */
a[href]         { color: #080; }
a[href]:visited { color: #884; }

div#content {

    margin-top: 0;
    margin-bottom: 0;
    margin-left: auto;
    margin-right: auto;

    max-width: 25cm;
    padding: 1em;

}

/* DOCBOOK */

.navheader hr, .navfooter hr {
    border: 0;
    border-bottom: 1px solid black;
}

.chapter div.toc,
.appendix div.toc {
    border: 1px solid #BCBCBC;
    background: #FBFBFB;
    margin: 2em;
    padding: 0 1em;
    font-size: 0.75em;
}

.programlisting, .screen {
    padding: 1em;
}

.replaceable {
    color: #008;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.05);
    font-style: normal;
    padding: 0 0.25em;
}

pre .emphasis em {
    font-style: normal;
    font-weight: bold;
}

.book .titlepage {
    text-align: center;
    padding: 2em;
}

.titlepage hr {
    display: none;
}

.titlepage .legalnotice {
    text-align: left;
}

.mediaobject {
    text-align: center;
    float: none;
    margin: 1em;
}

.mediaobject img {
    width: auto;
    max-width: 100%;
}

.screenshot img {
    border: 1px solid black;
}

.caption {
    font-size: 0.8em;
    font-style: italic;
}

.navfooter, .section {
    clear: both;
}

.table-contents, .informaltable {
    margin: 1em;
}

.table-contents table,
.informaltable table {
    border: 1px solid #BCBCBC;
    border-collapse: collapse;
    font-size: 10pt;
}

.table-contents th, .informaltable th {
    background: #FBFBFB;
}

.table-contents td, .table-contents th,
.informaltable td, .informaltable th {
    border: 1px solid #BCBCBC;
    padding: 0.5em;
    min-width: 1.5in;
}

.table-contents table table,
.informaltable table table {
    border: none;
}

.table-contents table table td,
.table-contents table table th,
.informaltable table table td,
.informaltable table table th {
    background: none;
    padding: 0.25em;
}

dl.variablelist {
    margin-left: 1em;
}

.variablelist .term {
    font-weight: bold;
}

blockquote {
    border-left: 1px solid rgba(0, 0, 0, 0.25);
    padding: 1px 1em;
    font-style: oblique;
    color: rgba(0, 0, 0, 0.75);
}

div.important {
    background: #FFFFE8;
    border: 1px solid rgba(0, 0, 0, 0.25);
    padding: 0 1em;
    margin: 2em;
}

/* Printable styles */

@media print {

    .navheader, .navfooter, .chapter .toc {
        display: none
    }

    body {
        font-size: 10pt;
    }

    .chapter > .titlepage {
        margin: 2em 0;
        font-size: 1.5em;
        text-align: center; 
    }

}