#menu ul { /* all lists */
    padding: 0;
    margin: 0;
    list-style: none;
    line-height: 1;
}

#menu a {
    display: block;
}

#menu li { /* all list items */
    float: left;
}

#menu li ul { /* second-level lists */
    position: absolute;
    left: -999em; /* using left instead of display to hide menus because display: none isn't read by screen readers */
}

#menu li:hover ul, #menu li.sfhover ul { /* lists nested under hovered list items */
    left: auto;
}