make menu bar fixed and not moving when scrolling

Description

Demo Code

<html>
 <head> 
  <meta name="viewport" content="width=device-width, initial-scale=1"> 
  <style id="compiled-css" type="text/css">
body {<!--from w ww.  j a  va  2 s.c om-->
   background-color:Chartreuse;
}

#wrap {
   width:1021px;
   margin-left:auto;
   margin-right:auto;
}

#menu {
   background-color:yellow;
   height:41px;
}

#menu ul li {
   text-decoration:none;
   display:inline;
   position:relative;
   float:left;
   width:11%;
}

#menu ul li>ul {
   display:none;
   text-align:center;
}

#menu ul li ul li {
   width:100%;
   float:none;
   display:block;
}

#menu ul li a {
   text-decoration:none;
   padding:11px 21px 0px 21px;
   color:blue;
   background-color:pink;
   font-family:Arial;
   display:block;
}

#menu ul li a:hover {
   color:OrangeRed;
   font-weight:bold;
}

#menu li:hover ul {
   display:block;
   background-color:grey;
}

#middle {
   background-color:BlueViolet;
   height:100%;
   width:100%;
   border-color:Chartreuse;
   border-radius:6px;
   margin-top:51px;
   margin-bottom:51px;
   box-shadow:0 0 2px yellow;
}

#footer {
   background-color:blue;
   border:2px solid pink;
   border-radius:6px;
   height:201px;
   margin-bottom:0px;
}
</style> 
 </head> 
 <body> 
  <div id="wrap"> 
   <div id="menu"> 
    <ul> 
     <li> <a href="#">Lor</a> </li> 
     <li> <a href="#">Lor</a> 
      <ul> 
       <li> <a href="#">Lor</a> </li> 
       <li> <a href="#">Lorem</a> </li> 
      </ul> </li> 
     <li> <a href="#">Lorem</a> </li> 
     <li> <a href="#">Lore</a> </li> 
     <li> <a href="#">Lore</a> </li> 
    </ul> 
   </div> 
   <div id="middle"></div> 
   <div id="footer"></div> 
  </div>  
 </body>
</html>

make menu bar fixed and not moving when scrolling - HTML CSS CSS Widget

Description

Demo Code

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