How can I centralize this menu?
ul{
margin: 0;
}
ul {
list-style: none;
}
a {
text-decoration: none;
}
.clearfix:after {
display: block;
content: " ";
clear: both;
}
#site-navigation {
background-color: #111;
border-top: 4px solid #289dcc;
}
li {
float:left;
position: relative;
font-family: 'Open Sans', serif;
font-weight: 300;
}
a {
color: #ffffff;
display: block;
font-size: 14px;
font-weight: 600;
padding: 10px 12px;
text-transform: uppercase;
}
.main-navigation a:hover, .main-navigation ul li.current-menu-item {
background-color: #289dcc;
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento sem título</title>
</head>
<link rel="stylesheet" id="colormag_style-css" href="files/style.css" type="text/css" media="all">
<body bgcolor="#000000" style="margin:0px;">
<div align="center"><b style="font-size:50px; color:#FFF">LOGO</b></div>
<nav id="site-navigation" class="main-navigation">
<div class="clearfix">
<ul>
<li><a href="#">MENU</a></li>
<li><a href="#">MENU</a></li>
<li><a href="#">MENU</a></li>
<li><a href="#">MENU</a></li>
<li><a href="#">MENU</a></li>
</ul></div>
</div>
</nav></div>
</body>
</html>