.table {
		display: table;
	}
	.table-row {
		display: table-row;
	}
	.table-row:hover {
		background-color: rgba(0,0,0,0.1);
	}
	.table-heading,
	.table-cell {
		display: table-cell;
		padding: 0.2em 0.5em;
	}
	.table-category {
		/* display: table-caption; */
		border-top: 1px solid #bbb;
	}
	.table-category h3 {
		font-size: 1.2em;
	}
	.table-heading {
		font-weight: bold;
	}

	.table-category,
	.table-head {
		border-bottom: 1px solid #bbb;
	}
	.table .number {
		text-align: right;
	}
	.nav ul {
		list-style-type: none;
	}
	.nav ul ul {
		padding-left: 0;
	}
	.nav ul > li > a {
		padding-left: 1em;
	}
	.nav ul ul a {
		padding-left: 2em;
	}
	#Introduction img {
		max-height: 20vw;
		margin: 10px;
	}