#main .greybox { padding: 8px; margin: 1em 0; border: 1px solid black; background: #ccc; }
#main .halfwidth { width: 50%; margin: 0 1em 1em 1em; font-size: 0.9em;}
#main table.figure{ border: 1px solid #444; border-collapse: collapse; margin: 1em; }
#main table.figure th { text-align: center; background-color: #aaa; font-size: 1em; font-weight: bold; }
#main table.figure td, table.figure th { border: 1px solid #444; padding: 1em 2em;}

sub, sup { line-height: 0; }