SO responsive elements order

by panchroma

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.1.0/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap-responsive.css">
<div class="container">
        <div class="row">
            <div class="header">
                <h2>Header</h2>
            </div>
        </div>
        <div class="row page-content">
            
            <div id="nav" class="span2">
                 <ul>
                    <li><a href="#">Home</a></li>
                    <li><a href="#">About</a></li>
                    <li><a href="#">Store</a></li>
                    <li><a href="#">Friends</a></li>
                  </ul>
            </div>
            

            <div id="content" class="span7">                
                <h1>Responsive Layout</h1>
                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
                <p>Curabitur et leo dui, eu semper tellus. Vivamus aliquam, mi ultrices fringilla varius, augue nisl tincidunt elit, eu tincidunt ante...

CSS

#nav.span2{
    float:right;
}

@media (max-width: 767px){
    #nav li
{
display: inline;
list-style-type: none;
padding-right: 20px;
}
}

.header
{
    background: #ff6600;
    padding:20px;
}

.page-content{
    margin-top:20px;
}
#nav ul {
    background: none repeat scroll 0 0 #A7DBD8;
    color: #333333;
    list-style: none outside none;
    margin: 0;
    overflow: hidden;
    padding: 20px;
}

#content
{
    background: none repeat scroll 0 0 #E0E4CC;
    color: #333333;
    margin-left:0px;
    padding:20px;
}

#sidebar
{
    background: none repeat scroll 0 0 #69D2E7;
    color: #FFFFFF;
    padding:20px;
}