@media only screen and (min-width: 768px) {
    #navigation.nav_horizontal > ul {
        display: table-row;
    }

    #navigation.nav_horizontal > ul li {
        display: table-cell;
        vertical-align: middle;
        border: 1px solid #CCC;
    }

    #navigation.nav_horizontal > ul li a {
        padding: 1em 1.5em;
        display: block;
    }
}