html - How to center align CSS navigation menu? -


can please me? i'm trying center navigation menu. have tried different things, nothing works, , don't know do. appreciate help. in advance!

nav { display: inline-block; list-style-type: none; float: left; width: 100%; height: 102px; text-align: center; }  nav > ul { float:right; width:100%; height:102px; background:#222; border-radius: 10px 10px 0px 0px; }     nav > ul > li { float:left; width:auto; margin-right:10px; line-height:102px; }     nav > ul li { padding:50px; color:white; font-family:helvetica, sans-serif; }  nav > ul > li > ul { background:#222; opacity:0; transition:opacity 1s; -webkit-transition:opacity 1s; -moz-transition:opacity 1s; -o-transition:opacity 1s; -ms-transition:opacity 1s; border-radius: 0px 0px 10px 10px; }     nav > ul > li:hover > ul { opacity:1; }

html

<div>  <nav>   <ul>    <li> <a href="#">hjem</a>     <ul>      <li><a href="#">sub1</a></li>      <li><a href="#">sub2</a></li>      <li><a href="#">sub3</a></li>     </ul>    </li>    <li><a href="#">bilder</a></li>    <li><a href="#">video</a></li>    <li><a href="#">design</a></li>   </ul>  </nav> </div>

here did.

#outer{   width:100%;   height: 102px;   text-align: center;   background:#222;   border-radius: 10px 10px 0px 0px; } nav {   display: inline-block;   list-style-type: none;   margin: 0 auto; }  nav > ul > li {   float:left;   width:auto;   margin-right:10px;   line-height:102px; }     nav > ul li {   padding:50px;   color:white;   font-family:helvetica, sans-serif; }  nav > ul > li > ul {   background:#222;   opacity:0;   transition:opacity 1s;   -webkit-transition:opacity 1s;   -moz-transition:opacity 1s;   -o-transition:opacity 1s;   -ms-transition:opacity 1s;   border-radius: 0px 0px 10px 10px; }     nav > ul > li:hover > ul {   opacity:1; }

and need give id div.

<div id="outer">

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