body {background-color:white}
			article {
			high:600px;
			min-width: 200px;
			max-width: 400px;
			padding: 10px;
			margin: 0px 5px 5px 0px;
			border: 1px dotted gray;
			background-color: white;
			}
			main {
			width: 70%;
			padding: 10px;
			margin: 0 auto;
			background-color: #CCFFCC;
			display: -webkit-flex;
			display: -ms-flexbox;
			flex-wrap: wrap;
			display: flex;
			flex-flow: row wrap;
			flex-direction: -webkit-row;
			flex-direction: -ms-row;
			flex-direction: row;
			justify-content:center;
			}
			header {
			width: 70%;
			background-color: #CCFFCC;			
			margin: 0 auto;
			padding: 2px 10px;
			}
			footer {
			width: 70%;
			background-color: #CCFFCC;			
			margin: 0 auto;
			padding: 2px 10px;
			}
			img {float:right;}
			.no_bullet {list-style: none;
			}
			.link_home {float:left; padding-left:1px; border:2px solid white;}
			.link_zurueck {float:right; padding-right:1px; border:2px solid white;}