table.opcode-table {
	border: 2px solid black;
}
th, td {
	border: 1px solid black;
	width: 9em;
}
td.empty {
	text-align: center;
	color: #A00;
}
td, th .number {
	width: 1em;
	color: #900;
	text-align: center;
}