Bootstrap CSS Vertical Menu

bootstrap3-vertical-menu.css

/*
As proposed by http://www.jonathanbriehl.com/
*/
/* make sidebar nav vertical */ 
@media (min-width: 768px) {
  .sidebar-nav .navbar .navbar-collapse {
    padding: 0;
    max-height: none;
  }
  .sidebar-nav .navbar ul {
    float: none;
  }
  .sidebar-nav .navbar ul:not {
    display: block;
  }
  .sidebar-nav .navbar li {
    float: none;
    display: block;
  }
  .sidebar-nav .navbar li a {
    padding-top: 12px;
    padding-bottom: 12px;
  }
}

bootstrap3-vertical-menu.html

<!--
As proposed by http://www.jonathanbriehl.com/
-->
<div class="row">

  <div class="col-sm-3">
    <div class="sidebar-nav">
      <div class="navbar navbar-default" role="navigation">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".sidebar-navbar-collapse">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <span class="visible-xs navbar-brand">Sidebar menu</span>
        </div>
        <div class="navbar-collapse collapse sidebar-navbar-collapse">
          <ul class="nav navbar-nav">
            <li class="active"><a href="#">Menu Item 1</a></li>
            <li><a href="#">Menu Item 2</a></li>
            <li class="dropdown">
              <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
              <ul class="dropdown-menu">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li class="divider"></li>
                <li class="dropdown-header">Nav header</li>
                <li><a href="#">Separated link</a></li>
                <li><a href="#">One more separated link</a></li>
              </ul>
            </li>
            <li><a href="#">Menu Item 4</a></li>
            <li><a href="#">Reviews <span class="badge">1,118</span></a></li>
          </ul>
        </div><!--/.nav-collapse -->
      </div>
    </div>
  </div>
  <div class="col-sm-9">
    <!-- Main Content -->
  </div>

</div>