anchor.diff:        </a>
         <ul class="nav-pills nav-stacked" style="list-style-type:none;">
         <% level.challenges.each do |challenge| %>
  -        <li><a href="#">Challenge <%= challenge.number %></a></li>
  +        <li><%= link_to "Challenge #{challenge.number}", scenario_level_challenge_path(@scenario, level, challenge), method: :get, remote: :true %>
         <% end %>
         </ul>
       </li>
  
positive.code:       <a href="#">
          <span class="fa-stack fa-lg pull-left">
            <i class="fa fa-server fa-stack-1x "></i>
          </span>Account
        </a>
        <ul class="nav-pills nav-stacked" style="list-style-type:none;">
          <li>
            <a href="#">
              <span class="fa-stack fa-lg pull-left">
                <i class="fa fa-flag fa-stack-1x "></i>
              </span>Progress
            </a>
          </li>
          <li>
            <a href="#">
              <span class="fa-stack fa-lg pull-left">
                <i class="fa fa-flag fa-stack-1x "></i>
              </span>Logout
            </a>
          </li>
        </ul>
      </li>
      <li>
        <a href="#">
          <span class="fa-stack fa-lg pull-left">
            <i class="fa fa-wrench fa-stack-1x "></i>
          </span>Help
        </a>
      </li>
    </ul>
  </div>
  
negative.code: <div id="sidebar-wrapper">
    <ul class="sidebar-nav nav-pills nav-stacked" id="menu">
      <li>
        <span><%= @scenario.name %></span>
      </li>
      <% @scenario.levels.each do |level| %>
      <li class="active">
        <a href="#">
  