html,body { height:100%;
            width:100%;
            text-align:center; }
body { background-color:#ddffdd;
       font-family:verdana;
       color:#006600;
       text-align:center; }
div#zentrier { width:70%;
               margin:auto;
               background-color:#eeeecc;
               color:#006600;
               padding:50px; }