body		{ background=rgb(228,228,228);
		  lang=en;}
dt		{ font-weight: bold;
		  margin-top: 2em; }
dd dt		{ font-weight: bold;
		  margin-top: 1em; }
code.bad	{ color: red}
code.lexical	{ color: blue}
code.nonterm	{ color: green}
pre.bad		{ font-family: monospace;
		  color: red}
h1		{text-align: center}