nav table {
    border-color: silver;
}

nav table td {
    padding: 0.3em;
}

nav table td a:hover {
    font-weight: normal;
}

.navtab {
    width: 10.7em;
    margin-left: auto;
    margin-right: auto;
    border-spacing: 0.4em;
    /*transition: 0.5s;*/
}

.navtd {
    /*width: 10em;*/
    text-align: center;
    border-width: 0.1em;
    border-radius: 0em 0.5em 0em 0.5em;
    border-style: outset;
    border-color: silver;
}

.navtd:hover {
    border-radius: 0.5em 0em 0.5em 0em;
    border-style: inset;
}

.navtdact {
    /*width: 10em;*/
    text-align: center;
    border-width: 0.1em;
    border-radius: 0.5em 0em 0.5em 0em;
    border-style: inset;
    background-color: rgba( 110, 110, 110, 0.5);
    border-color: silver;
    /*transition:0.5s*/
}