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

<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<!doctype html>
<html lang=''>
<head>
   <meta charset='utf-8'>
   
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="stylesheet" href="styles.css">
   <title>Grupo &reg - www.grupor.com.br</title>
</head>
<body>
<div id="tudo">
<div id='cssmenu' class = 'menu'>
<ul>
    
   <li class='active'><li><a href=# target = "centro">Sobre a Empresa</a></li>
    <li><a href="#">Produtos</a></li>
    <li><a href="#">Downloads / Sistemas</a>
        <ul class="submenu">
            <li><a href=#>Sub 1</a></li>
            <li><a href=#>Sub 2</a></li>
        </ul>
    </li>
    <li><a href="#">Servi&ccedil;os</a></li>
    <li><a href="#">Contato</a> </li>
</ul>
</div>
<div id="conteudo">
  <iframe src="centro.html" width="100%" height="100%" name="centro"  MARGINWIDTH=0 MARGINHEIGHT=0 HSPACE=0 VSPACE=0 FRAMEBORDER=0 SCROLLING=0>
  </iframe>
</div>
</div>
</body>
</html>

styles.css

@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;
  
}

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