<div class="navbar navbar-fixed-top">NAVBAR</div>
  <div class="contents">
    <div class="row-fluid">
      <div class="span12">
        <h3>Here is some additional stuff</h3>
        <h5>And even more</h5>
      </div>
    </div>
    <div class="row-fluid">
      <div id="wrapper">
        <div class="span8">
          ...
        </div>
        <div class="span4">
          <div class="menu">
            <ul class="nav nav-tabs">
              <li><a href="#first" data-toggle="tab">First</a></li>
              <li><a href="#second" data-toggle="tab">Second</a></li>
            </ul>
            <div class="tab-content">
              <div id="first" class="tab-pane active">
                <ul>
                  ...
                </ul>
              </div>
              <div id="second" class="tab-pane">Second tab contents</div>
            </div>
            <button>Menu Button</button>
          </div>
        </div>
      </div>
    </div>
    <div class="row-fluid">
      <div class="span12">
        <button>Button I don't want hidden</button>
      </div>
    </div>
  </div>

.menu.sticky {
  bottom: 40px;
  right: 20px;
  position: fixed;
  top: 55px;
}
.menu.sticky .tab-content {
  overflow: auto;
}