div.centrado{
text-align: center;
}
div.centrado table {
margin: 0 auto;
} - See more at: http://www.unblogmas.com/posts/centrando-tablas-con-css/#sthash.BaWW8zpv.dpuf

* {
font-family:Arial, Helvetica, sans-serif;
list-style:none;
text-decoration:none;
margin:0;
padding:0;
}

.nav > li {
float:left;
}

.nav li a {
background:#00a7d8;
color:#FFF;
display:block;
border:0px solid;
padding:5px 12px;
}

.nav li .flecha{
font-size: 0px;
padding-left: 6px;
display: none;
}

.nav li a:not(:last-child) .flecha {
display: inline;
}

.nav li a:hover {
display: block;
background:#0389b1;
}

.nav li {
position:relative;
}

.nav li ul {
display:none;
position:absolute;
min-width:230px;
}

.nav li:hover > ul {
display:block;
}

.nav li ul li ul {
right:-140px;
top:0;
}