header{margin-left:auto;margin-right:auto;text-align:center;position:center;color:green;margin:20px;padding:20px;background-color:black;width:300px;height:auto;border:3px solid green}section{margin-left:auto;margin-right:auto;text-align:center;position:center;color:green;background-color:black;border:3px solid green;margin:20px;height:auto;width:300px;padding:20px}body{background-image:url(Bild.gif);position:center;text-align:center}head{position:center;text-align:center}