how to set the footer at the bottom of the page in html code example

Example 1: why is my footer not at the bottom html

#footer {
   position:fixed;
   left:0px;
   bottom:0px;
   height:30px;
   width:100%;
   background:#999;
}

//name footer id="footer"

Example 2: how to set the footer at the bottom using css

<!DOCTYPE html>

<html>
 <head>
   <link rel="stylesheet" type="text/css" href="main.css" />
 </head>

<body>
 <div id="page-container">
   <div id="content-wrap">
     <!-- all other page content -->
   </div>
   <footer id="footer"></footer>
 </div>
</body>

</html>

Tags:

Css Example