html - Unable to position an element -

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i'm trying position 'about me' box unable posiition down. can move left or right using margin-left or margin-right properties i'm not able move top or down. have used float:right position sidebar. used clear:both on header. still remains stationary.

the following images understand problem.

enter image description here

the code of page here (jsfiddle)

<!doctype html>  <html>  <head>     <meta charset="utf-8">     <meta name="description" content="description">     <link rel="stylesheet" media="screen" href="style123.css">      <!--[if ie]>     <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>     <![endif]-->         <title>my first page</title> </head>  <body>     <div id="wrapper">         <ul id="nav">             <li><a href="#">home</a></li>             <li><a href="#">about</a></li>             <li><a href="#">work</a></li>             <li><a href="#">contact</a></li>         </ul>          <div id="box">             <h3> me </h3>         </div>       </div> </body> </html>

css:

body {    background: #091a1b;    color: #544738;    font-family: helvetica, sans-serif; }  #nav {       margin-top: 0px;       float: right; }  ul li {     float: left;     list-style: none;     margin-right: 1em;  }  li {     color: #544738;     text-decoration: none;     float: left;     font-size: 25px;     padding: 12px; }  li a:hover {     -webkit-transform: rotate(-10deg) scale(1.2);     -moz-transform: rotate(-10deg) scale(1.2);     -o-transform: rotate(-10deg) scale(1.2);     color: #25296f; }  #box {       background-color: black;       width: 150px;       height: 38px;       margin-left: 500px;       clear: both;       margin-top: 500px;     } 

 #box { position:absolute;  background-color: black;  width: 150px;  height: 38px;  margin-left: 0px;  clear: both;  margin-top: 200px;

}

take @ demo: give different position margin-top , position changes....

demo: http://jsfiddle.net/praveen16oct90/zfzp7/1/


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