div#nav{
  text-align: center;
}

div#nav ul{
  display: inline-block;
}

#nav li {
    font-size: 15pt; 
    display: inline; /* li nebeneinander anzeigen */
    list-style-type: none; /* ohne Aufzählungspunkte */   
}

body {
  margin: 0 auto;
  padding-top: 100px;
  font-family: helvetica, arial, tahoma, sans-serif;
  font-size: 11px;
}

img {
    display: block;
    margin-top: 50px; 
    margin-left: auto;
    margin-right: auto;
}

#adresse {
  text-align: center;
  padding-top: 40px; 
}

#karten {
  text-align: center;
  padding-top: 30px;
  font-size: 14px; 
}