body {
    font-family: 'Segoe UI';
    font-size: 125%;
}

 #id_ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

#id_ul li {
    float: left;
}

#id_ul a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

        /* Change the link color to #111 (black) on hover */
#id_ul li a:hover {
    background-color: #100; /* era #111 */
}

.table {
    border: 1px solid black;
    height: 100%;
    width: 100%;
    table-layout: fixed;
    border-collapse: collapse;
    border-spacing: 1px;
    text-align: left;
}

.table td {
    border: 1px solid black;
    background-color: #ffffff;
    color: #000000;
    padding: 15px;
    text-align:justify;
}

#div_centrale {
    width:90%;
    margin:0 auto;
}