#nav {
    margin: auto;
    width: 100%;
    font-weight: bold;
}
.thumbnail {
    padding: 3px 3px 0px 3px;
    text-align: center;
}
.thumbnail a {
    text-decoration: none;
    border: none;
}
.thumbnail img { 
    border-style: none;
}

body {
     font-family: Georgia, "New Century Schoolbook", Times, serif;
     background-color: #D3D3D3;
}

.main {
    text-align: center;
    margin: auto;
}

.main a {
    text-decoration: none;
    border: none;
}
.main img { 
    border-style: none;
}

#header {
    background-color: #318;
    text-align: center;
    padding: 10px;
    color: silver;
    font-family: Helvetica, Arial, sans-serif;
}

#header img {
    display: block;
    margin: 15px auto 10px;
}

.adblock {
    border: medium solid;
    border-color:blue;
    margin: 8px auto;
    background-color:#edd;
    padding: 5px;
    -moz-border-radius: 10px;
    text-align: center;
    width: 560px;
}

.adblock a {font-weight: bold;}
.adblock p {margin: 4px;}


.zentrum2 {
    text-align: center;
    margin: 0 auto;
}