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:hover>ul {
display:block;
}