Centralizar Css

Amigos, estou a um tempo tentando centralizar os Menus, porem sem sucesso, alguem pode me dar uma ajuda onde está o a dificuldade?

index.html

[code]

<!doctype html>

Grupo &reg - www.grupor.com.br
[/code]

styles.css

[code]@import url(http://fonts.googleapis.com/css?family=Lato:300,400,700);
@charset “UTF-8”;
/* Base Styles */
#conteudo{
height: 410px;
background: transparent;
}

#cssmenu > ul,
#cssmenu > ul li,
#cssmenu > ul ul {
list-style: none;
margin: 0;
padding: 0;

}
#cssmenu > ul {
position: relative;
z-index: 597;
float: left;
}
#cssmenu > ul li {
float: left;
min-height: 1px;
line-height: 1.3em;
vertical-align: middle;
padding: 10px;

}
#cssmenu > ul li.hover,
#cssmenu > ul li:hover {
z-index: 599;
cursor: default;

}
#cssmenu > ul ul {
visibility: hidden;
position: absolute;
top: 100%;
left: 0;
z-index: 598;

}
#cssmenu > ul ul li {
float: none;

}
#cssmenu > ul li:hover > ul {
visibility: visible;
}
/* Align last drop down RTL /
/
Theme Styles */
#cssmenu > ul a:link {
text-decoration: none;
}
#cssmenu > ul a:active {
color: #ffa500;
}
#cssmenu li {
padding: 0;
color: #000;

}
#cssmenu {
font-family: ‘Lato’, sans-serif;
width: auto;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
-ms-border-radius: 3px;
-o-border-radius: 3px;
border-radius: 3px;
background: #006400;
font-size: 13px;
-moz-box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.3);
-webkit-box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.3);
box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.3);

}
#cssmenu > ul {
padding: 0 5px;
-moz-box-shadow: inset 0 -2px 2px rgba(0, 0, 0, 0.3);
-webkit-box-shadow: inset 0 -2px 2px rgba(0, 0, 0, 0.3);
box-shadow: inset 0 -2px 2px rgba(0, 0, 0, 0.3);
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
-ms-border-radius: 3px;
-o-border-radius: 3px;
border-radius: 3px;
display: block;
float: none;
zoom: 1;

}
#cssmenu > ul:before {
content: ‘’;
display: block;

}
#cssmenu > ul:after {
content: ‘’;
display: table;
clear: both;

}
#cssmenu > ul > li {
padding: 8px 5px;

}
#cssmenu > ul > li > a,
#cssmenu > ul > li > a:link,
#cssmenu > ul > li > a:visited {
text-shadow: 0 -1px 1px #004881;
color: #fff;
padding: 7px 20px;
display: block;
-webkit-border-radius: 3px;
-moz-border-radius: 3px;
-ms-border-radius: 3px;
-o-border-radius: 3px;
border-radius: 3px;

}
#cssmenu > ul > li > a:hover,
#cssmenu > ul > li:hover > a {
background-color: #0082e7;

}
#cssmenu li li a {
color: #8b8b8b;
font-size: 13px;

}
#cssmenu li li a:hover {
color: #5c5c5c;
border-color: #5c5c5c;

}
#cssmenu ul ul {
margin: 0 10px;
padding: 0 10px;
float: none;
background: #efefef;
border: 2px solid #1b9bff;
border-top: none;
right: 0;
left: 0;
-webkit-border-radius: 0 0 3px 3px;
-moz-border-radius: 0 0 3px 3px;
-ms-border-radius: 0 0 3px 3px;
-o-border-radius: 0 0 3px 3px;
border-radius: 0 0 3px 3px;
-moz-box-shadow: 0 2px 3px rgba(0, 0, 0, 0.2);
-webkit-box-shadow: 0 2px 3px rgba(0, 0, 0, 0.2);
box-shadow: 0 2px 3px rgba(0, 0, 0, 0.2);

}
#cssmenu ul > li > ul > li {
margin: 0 10px 0 0;
position: relative;
padding: 0;
float: left;

}
#cssmenu ul > li > ul > li > a {
padding: 10px 20px 10px 10px;
display: block;

}
#cssmenu ul > li > ul > li.has-sub > a:before {
content: ‘’;
position: absolute;
top: 18px;
right: 6px;
border: 5px solid transparent;
border-top: 5px solid #8b8b8b;

}
#cssmenu ul > li > ul > li.has-sub > a:hover:before {
border-top: 5px solid #5c5c5c;

}
#cssmenu ul ul ul {
width: 200px;
top: 100%;
border: 2px solid #1b9bff;

}
#cssmenu ul ul ul li {
float: none;

}

[/code]

Leia esse artigo, com certeza irá te ajudar: http://maujor.com/tutorial/centralizando-com-css-um-guia-completo.php

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