body{  margin: 0;  padding: 0;} header{  font-family: Helvetica;   width: 580px;  margin: 0 auto;} ul{  list-style: none;} #menu li>a{  background-color: grey;  color: white;  padding: 10px;  display: block;  text-decoration: none;  min-width: 100px;} #menu li>a:hover{  color: #000;  background-color: #eaeaea; } #menu>li{  float: left;  text-align:center} #menu>li>ul{  display: none;
} #menu>li:hove>ul {  display:block;}