.error { margin-left: 4ex; margin-right: 4ex; }

table.structure { border-collapse: collapse; }
table.structure th, table.structure td {
	text-align: center; vertical-align: top;
	border: 1px solid black; padding: 0.5ex 0.5em;
}

#edit-rules, #edit-vocabulary { float: left; width: 50%; }
#edit-rules p, #edit-vocabulary p { margin: 0; }

textarea { font-size: smaller; width: 90%; }