The following code shows how to hide Element under fixed position header.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-2.0.2.js'></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css">
<style type='text/css'>
body {<!-- w w w .ja v a 2 s. c o m-->
background: grey;
padding-top: 70px;
}
section {
background: tan;
display: block;
width: 400px;
height: 200px;
margin: 20px;
padding-top: 60px;
margin-top: -60px;
}
</style>
<script type='text/javascript'>
$(window).load(function(){
$('.nav a').on('click', function(){
$(".navbar-toggle").click();
});
});
</script>
</head>
<body>
<!-- Nav Bar -->
<nav class="navbar navbar-default navbar-fixed-top" role="navigation"
id="SiteNavBar">
<!-- Nav Bar Header -->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse"
data-target=".navbar-ex1-collapse">
<span class="sr-only">Toggle navigation</span> <span
class="icon-bar"></span> <span class="icon-bar"></span> <span
class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>
<!-- Nav Bar Links -->
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<li><a href="#Home">Home</a></li>
<li><a href="#About">About</a></li>
<li><a href="#Resume">Resume</a></li>
<li><a href="#Projects">Projects</a></li>
<li><a href="#Contact">Contact</a></li>
</ul>
</div>
</nav>
<section id="Home">Home</section>
<section id="About">About</section>
<section id="Resume">Resume</section>
<section id="Projects">Projects</section>
<section id="Contact">Contact Me</section>
<div
style='position: fixed; bottom: 0; left: 0; background: lightgray; width: 100%;'>
About this SO Question: <a
href='http://stackoverflow.com/q/18948440/1366033'>Element is
hidden under fixed position header</a><br /> Fork This Skeleton Here <a
href='http://jsfiddle.net/KyleMit/kcpma/'>Bootrsap 3.0 Skeleton</a><br />
<div>
</body>
</html>