nav ul {
    list-style-type: none;
    margin: 0px;
    padding: 0px;
}

nav ul li a {
    text-decoration: none;
    display: block;
    width: 270px;
    //width: 212px;			
    float: left;
    padding: 10px;
    text-align: center;
    background-color: #999999;		<!--  Barra -->
    font-size: 20px;			<!-- inserito -->
}

nav ul li a:hover {
    color: #FFFFFF;
    background-color: #666;		<!-- #666;-->
}

nav ul li a:active {
    color: #999;
    background-color: #3A3642;		<!--  -->
}

.pagina_selezionata {
    color: #FFFFFF;
    background-color: #000;
}