I am currently building a mobile collapsable navbar that when the screen is shrunk the items along the navbar disappear and then appears a hamburger button with a select dropdown of the formerly hidden items. I have been following this previously asked questions, How to add hamburger menu in bootstrap, but I do not see where I went wrong as once the text is hidden and the hamburger button appears I do not have a dropdown menu to select from
<html>
<head>
<title> Bubble</title>
</head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.13/semantic.min.css">
<link rel="stylesheet" href="/blog/main/main.css">
<body>
<nav class="navbar navbar-inverse navbar-static-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#hamburger" aria-expanded="false" aria-label="Toggle navigation">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a href="/" class="navbar-brand"><i class="large line chart icon"></i>Dr. Denver Housing Bubble</a>
</div>
<div class="collapse navbar-collapse" id="hamburger">
<ul class="nav navbar-nav">
<li><a hef="#">About</a></li>
<li><a hef="#">Blogs</a></li>
<li><a hef="#">Donate</a></li>
<li><a hef="#">Contact</a></li>
<li><a href="/login">Login</a></li>
<li><a href="/register">Sign Up</a></li>
<li><a href="#"> Signed In As Ralph</a></li>
<li><a href="/logout">Logout</a></li>
</ul>
</div>
</div>
</nav>
