SO content hidden under footer

HTML

<script src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/js/bootstrap.min.js"></script>
       
    <!--navbar here-->
    <div class="navbar">
        <div class="navbar-inner navbar-fixed-top">
            <a class="brand" href="/" ><i class="icon-phone-sign icon-2x"></i></a>
            <ul class="nav">
                <!--<li class="active"><a href="/">Home</a></li> --> 
                <li>  
                    <form id="login" class="form-inline" method="post">
                        <input type="text" class="input-small" placeholder="Email">
                        <input type="password" class="input-small" placeholder="Password">
                        <label class="checkbox">
                            <input type="checkbox"> Remember me   
                        </label>
                        <button type="submit" class="btn btn-inverse signIn">Log in</button>
                    </form>
                </li>               
            </ul>
        </div>
    </div>    

     <!--content-->
    <div class="centerContent">
        <div id="header">   
            <h1>This is the FAQ page.</h1>
        </div>
        <div class="faqheader">
            <h3>Question 1?</h3>
            Nunc iaculis leo nec orci iaculis interdum eu at magna. Sed condimentum condimentum rutrum. Proin felis libero, volutpat vel congue ultricies, ultricies id risus. Phasellus scelerisque mi eu velit imperdiet vel interdum arcu rhoncus. Nunc sagittis sagittis lectus et faucibus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Maecenas placerat feugiat neque eu interdum. Etiam massa ligula, faucibus at molestie sit amet, lobortis non nunc. Sed volutpat aliquam lorem sit amet tincidunt.   
        </div>
        <div class="faqheader">
            <h3>Question 2?</h3>
            Nunc iaculis leo nec orci iaculis interdum eu at magna. Sed condimentum condimentum rutrum. Proin felis libero, volutpat vel congue...

CSS

@import url("http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css");


.navbar-fixed-bottom {
clear:  both;
background-color: #e1e1e1;
padding: 20px;
 }

#footer {

font-size: 16px;

 }

#socialFooter {
float:  right;
 }