.nav {
 clear: both;
 float: left;
 width: 100%;
 margin-bottom: 35px;
 overflow: hidden;
 background: #fff;
 font-family: Arial, Calibri light, Verdana, Helvetica, sans-serif, light;
 font-size: 15px;
 line-height: 1.3em;
 text-align:center;
 
 }

 #navi {
 margin: 0;
 padding: 0; 
 list-style-type: none;
 }

 #navi li {
 float: left; /* Navi horizontal */
 }

 #navi a {
 width: auto;
 display: block;
 height:31px; /* Höhe Logo (45px) - padding top */
 padding:10px 32px 0 32px;
 margin-right:1px;
 color: #000; 
 background: #fff; 
 text-decoration:none;
 }

 #navi a:hover {
 background: #000;
 color: #fff;
 } 
 
 .aktiv {
 width: auto;
 display: block;
 height:31px; /* Höhe Logo (45px) - padding top */
 padding:10px 32px 0 32px;
 margin-right:1px;
 color: #fff; 
 background: #000; 
 text-decoration:none;
 }