.navigation {
    margin: 0px;
    padding: 0px;
    text-align: center;
}

.navigation li { 
    display: inline;
}

.navigation a {
    padding: 5px;
    border: 1px solid #000000;
    margin: 2px;
    text-decoration: none;
}

.navigation a:hover {
    background-color: #3399ff;
    color: #FFFFFF;
}

.navigation_selected {
    padding: 5px;
    color: #FFFFFF;
    border: 1px solid #000000;
    margin: 2px;
    background-color: #3399ff;
}