"Affix scroll spy nav bar"
Bootstrap 3.3.0 Snippet by Android272

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<body data-spy="scroll" data-target=".scrollspy">
<header>
<nav class="nav navbar-default navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
<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="/index.html">Brand</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li><a href="/about.html">Tutorial</a>
</li>
<li><a href="/membership_details.html">Page</a>
</li>
<li><a href="/sign_up.html">Tips</a>
</li>
<li><a href="/log_in.html">Log Out</a>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
</nav>
</header>
<section class="container">
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.side-nav {
position: fixed;
top: 5em;
}
.affix {
top: 5em;
width: 20.45em;
}
.affix-bottom {
position: absolute;
width: 20.45em;
}
@media (min-width: 1200px) {
.affix-bottom {
width: 20.45em;
}
}
body {
position: relative;
}
.side-nav .nav .active {
font-weight: bold;
}
.nav .nav {
display: none;
}
.nav .active .nav {
display: block;
}
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$('#nav').affix({
offset: {
top: $('#nav').offset().top
}
});
$('#nav').affix({
offset: {
bottom: ($('footer').outerHeight(true) +
$('.application').outerHeight(true)) +
40
}
});
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