.button_menu a {
    border-bottom: 1px solid #777777;
    border-left: 1px solid #000000;
    border-right: 1px solid #333333;
    border-top: 1px solid #000000;
    color: #FFFFFF;
    display: block;
    height: 2.5em;
    padding: 0 1em;
    width: 15em;
    text-decoration: none;
    font-weight: bold;
    font-size: large;
}