SO double col

HTML

<link rel="stylesheet" href="http:////netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<script src="http:////netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/js/bootstrap.min.js"></script>
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Bootstrap, from Twitter</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="">
    <meta name="author" content="">

    <!-- Le styles -->
    <link href="../assets/css/bootstrap.css" rel="stylesheet">
    <style type="text/css">
      body {
        padding-top: 60px;
        padding-bottom: 40px;
      }
      .sidebar-nav {
        padding: 9px 0;
      }

      @media (max-width: 980px) {
        /* Enable use of floated navbar text */
        .navbar-text.pull-right {
          float: none;
          padding-left: 5px;
          padding-right: 5px;
        }
      }
    </style>
    <link href="../assets/css/bootstrap-responsive.css" rel="stylesheet">

    <!-- HTML5 shim, for IE6-8 support of HTML5 elements -->
    <!--[if lt IE 9]>
      <script src="../assets/js/html5shiv.js"></script>
    <![endif]-->

    <!-- Fav and touch icons -->
    <link rel="apple-touch-icon-precomposed" sizes="144x144" href="../assets/ico/apple-touch-icon-144-precomposed.png">
    <link rel="apple-touch-icon-precomposed" sizes="114x114" href="../assets/ico/apple-touch-icon-114-precomposed.png">
      <link rel="apple-touch-icon-precomposed" sizes="72x72" href="../assets/ico/apple-touch-icon-72-precomposed.png">
                    <link rel="apple-touch-icon-precomposed" href="../assets/ico/apple-touch-icon-57-precomposed.png">
                                   <link rel="shortcut icon" href="../assets/ico/favicon.png">
  </head>

  <body>

    <div class="navbar navbar-inverse navbar-fixed-top">
      <div class="navbar-inner">
        <div class="container-fluid">
          <button type="button" class="btn...