html {
	box-sizing: border-box;
}

*,
::before,
::after {
	box-sizing: inherit;
}

body {
	margin: 10px auto;
	max-width: 60em;
	font-family: sans-serif;
	color: #333333;
}

header,
nav,
nav a,
main,
article,
section,
aside,
footer {
	border-radius: 0.5em 0.5em 0.5em;
	border: 1px solid;
	padding: 10px;
	margin: 10px;
}

header {
	background: #F1F3F4;
	border-color: #d5d5d5;
}

header img {
	margin-right: 50px;
	float: left;
}

nav {
	font-size: 0.91em;
	padding: 0;
	background: #fffbf0;
	border-color: #e7c157;
}

nav ul {
	padding: 0;
}

nav li {
	list-style: none;
	margin: 0;
	padding: 0.5em;
}

nav a {
	display: block;
	padding: 0.2em 10px;
	font-weight: bold;
	text-decoration: none;
	background-color: #e7c157;
	color: #333;
}

nav ul a:hover,
nav ul a:active {
	color: #fffbf0;
	background-color: #dfac20;
}

main {
	display: block;
	background: #c4ced3;
	border-color: #8a9da8;
	min-width: 16em;
	/* Mindestbreite (der Ueberschrift) verhindert Anzeigefehler in modernen Browsern */
}

section {
	background: #F1F3F4;
	border-color: slateblue;
}

article {
	background: #ffede0;
	border-color: #df6c20;
}

aside {
	background: #ebf5d7;
	border-color: #8db243;
}

footer {
	background: #e4ebf2;
	border-color: #8a9da8;
}

footer p {
	float: right;
	margin: 0;
}

@media (min-width: 32em) {
	/* mehrspaltiges Layout für breitere Viewports */
	nav {
		float: left;
		width: 15em;
	}
	main {
		margin-left: 15em;
	}
}

p {
	text-align:justify;
}

div.table {
	display: table;
	width: calc(100% - 10px);
	border: 1px solid blue;
	padding: 5px;
}

div.zeile {
	display: table-row;
}
	
div.spalte {
	display: table-cell;
	border: thin solid gainsboro;
	width: 200px;
	padding: 5px;
}