Center or justify the voices of the menu?

Hi, I'd need to center of justify the voices of the main menu in this site: www.giemme-staff.it/ (now they are aligned on the left)
I tried in custom.css two solutions that did not work:

1)
.menu-inner {
float:center;
text-align:left;
}

2)
.uk-navbar-nav {
margin: 0;
padding: 0;
list-style: none;
float: center;
}

Ciao
Luca

Hi there,
float:center is a wrong css syntax.
Please use: float:none and then text-align:center and display:inline-block

TIPP:
css-tricks.com/centering-list-items-hori...han-you-might-think/

Sorry, I'm not so good with syntax
Now I tried:

.uk-navbar-nav {
float: none;
text-align: center;
display: inline-block;
}

Be patient, please...
Luca