body {
 margin:0 auto;
 padding:0;
 background:#000 url(../images/main-bg.jpg) repeat;
}

div#auswahl-01 a {
 position:absolute;
 top:50%;
 left:50%;
 width:648px;
 height:510px;
 margin-top: -255px;
 margin-left: -324px;
 border:1px solid #666666;

 background:url(../images/lea_01.png) no-repeat;
}

div#auswahl-01 a:hover {
  border:1px solid #f00;
}

div#auswahl-02 a {
 position:absolute;
 top:50%;
 left:50%;
 width:530px;
 height:347px;
 margin-left: -255px;
 margin-top: -174px;
 border:1px solid #666666;
 background:url(../images/lea_02.jpg) no-repeat;
}

div#auswahl-02 a:hover {
  border:1px solid #f00;
}