#menu {
float:left;
background-color:#333;
text-align: center;
font-size: 12px;
width: 870px;
padding:15px;
margin:0 auto;
}
#menu ul {
list-style-type: none;
margin:0 0 0 -20px;
}
#menu ul li.nivel1 {
float: left;
margin:0;
width: 140px; /*106*/
}
#menu ul li a {
display: block;
text-decoration: none;
color: #fff;
background-color: #333;
padding: 8px;
}
#menu ul li a:hover, #menu ul li:hover a.nivel1 {
background-color: #16367F;
color: #fff;
}