menu.css

.menu ul ul{display:none;position:absolute;height:0;top:48px;left:0;width:128px}.menu ul ul ul{left:128px;top:0;width:128px}.menu :hover>a,.menu ul ul :hover>a{background:#8f8f8f}.menu ul :hover ul,.menu ul :hover ul :hover ul{display:block}.menu ul :hover ul ul{display:none}