example of box centering menu in wordpress mainav menu

#mainnav-menu {
//float: left;
//list-style-type: none;
//list-style-position: outside;
//position: relative;
//background: #004488;
//adaugat de mine
   
width: 70%;
height: 5%;
top: 28%;
left: 8%;
position: absolute;
margin-top: 1%;
margin-left: 0px;
border: solid 1px #ccc;
background: #004488;
}