lib/html/isabelle.css

added some markup for outer syntax;

/* css style file for generated Isabelle HTML output */

body { background-color: #FFFFFF; }

.tclass { color: red; }
.tfree  { color: purple; }
.tvar   { color: purple; }
.free   { color: blue; }
.skolem { color: brown; }
.bound  { color: green; }
.var    { color: blue; }
.xstr   { color: brown; }
.loc    { color: brown; }

.name     { font-style: italic; }
.keyword  { font-weight: bold; }
.command  { font-weight: bold; }
.filename { font-family: fixed; }

.head     { background-color: #FFFFFF; }
.source   { background-color: #F0F0F0; padding: 10px; }
.theorems { background-color: #E0E0E0; padding: 10px; }

.mlsource { background-color: #F0F0F0; padding: 10px; }
.mlfooter { background-color: #FFFFFF; }

.theories { background-color: #F0F0F0; padding: 10px; }
.sessions { background-color: #F0F0F0; padding: 10px; }

.junk           { background-color: #FF6A6A; font-weight: bold; }

.string         { color: #008B00; }
.altstring      { color: #8B8B00; }
.verbatim       { color: #00008B; }
.comment        { color: #00008B; }
.control        { background-color: #FF6A6A; font-weight: bold; }
.malformed      { background-color: #FF6A6A; font-weight: bold; }

/* hide hr for this style */
hr { height: 0px; border: 0px; }