Navigation Bar 100% Width Centering - css

Question

I've been trying for a while now to center everything that's in my Navigation Bar. Here's my CSS and HTML code I would appreciate it if anyone could give me a hint on what to do.
#cssmenu ul {
margin: 0;
padding: 0;
}
#cssmenu li {
margin: 0;
padding: 0;
}
#cssmenu a {
margin: 0;
padding: 0;
}
#cssmenu ul {
list-style: none;
}
#cssmenu a {
text-decoration: none;
}
#cssmenu {
height: 70px;
background-color: #232323;
box-shadow: 0px 2px 3px rgba(0, 0, 0, 0.4);
width: auto;
text-align: center;
}
#cssmenu > ul > li {
float: left;
margin-left: 15px;
position: relative;
}
#cssmenu > ul > li > a {
color: #a0a0a0;
font-family: Verdana, 'Lucida Grande';
font-size: 15px;
line-height: 70px;
padding: 15px 20px;
-webkit-transition: color .15s;
-moz-transition: color .15s;
-o-transition: color .15s;
transition: color .15s;
}
#cssmenu > ul > li > a:hover {
color: #ffffff;
}
#cssmenu > ul > li > ul {
opacity: 0;
visibility: hidden;
padding: 16px 0 20px 0;
background-color: #fafafa;
text-align: left;
position: absolute;
top: 55px;
left: 50%;
margin-left: -90px;
width: 180px;
-webkit-transition: all .3s .1s;
-moz-transition: all .3s .1s;
-o-transition: all .3s .1s;
transition: all .3s .1s;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.4);
-moz-box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.4);
box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.4);
}
#cssmenu > ul > li:hover > ul {
opacity: 1;
top: 65px;
visibility: visible;
}
#cssmenu > ul > li > ul:before {
content: '';
display: block;
border-color: transparent transparent #fafafa transparent;
border-style: solid;
border-width: 10px;
position: absolute;
top: -20px;
left: 50%;
margin-left: -10px;
}
#cssmenu > ul ul > li {
position: relative;
}
#cssmenu ul ul a {
color: #323232;
font-family: Verdana, 'Lucida Grande';
font-size: 13px;
background-color: #fafafa;
padding: 5px 8px 7px 16px;
display: block;
-webkit-transition: background-color 0.1s;
-moz-transition: background-color 0.1s;
-o-transition: background-color 0.1s;
transition: background-color 0.1s;
}
#cssmenu ul ul a:hover {
background-color: #f0f0f0;
}
#cssmenu ul ul ul {
visibility: hidden;
opacity: 0;
position: absolute;
top: -16px;
left: 206px;
padding: 16px 0 20px 0;
background-color: #fafafa;
text-align: left;
width: 180px;
-webkit-transition: all .3s;
-moz-transition: all .3s;
-o-transition: all .3s;
transition: all .3s;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.4);
-moz-box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.4);
box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.4);
}
#cssmenu ul ul > li:hover > ul {
opacity: 1;
left: 190px;
visibility: visible;
}
#cssmenu ul ul a:hover {
background-color: #cc2c24;
color: #f0f0f0;
}
And finally my HTML.
<div id='cssmenu'>
<ul>
<li class='active'><a href='index.html'><span>Home</span></a></li>
<li><a href='#'><span>Forums</span></a></li>
<li><a href='#'><span>Title1</span></a></li>
<li><a href='#'><span>Title2</span></a></li>
<li><a href='#'><span>Title3</span></a></li>
<li class='last'><a href='#'><span>Title4</span></a></li>
</ul>
</div>
Currently all that happens is my navigation bar is 100% width which is what I want but, the buttons are still aligned to the left and I want them to be in the center. I've tried numerous things and can't seem to make it work. Any help is greatly appreciated.

Answer 1

You only need this :
#cssmenu > ul {
display:table;
margin:0 auto;
}
View the demo http://jsfiddle.net/sn3Hn/2/

Answer 2

Use same structure, but you need change your css:
#cssmenu ul
{
text-align: center;
}
#cssmenu li
{
display: inline-block; < Secret;
margin: 0;
padding: 0;
}
Codepen > http://cdpn.io/usChr
Resolve?
Good lucky

Answer 3

I've had success using the css table method.
#cssmenu ul {
display: table;
width: 100%;
}
#cssmenu ul li {
display: table-cell;
}