anchor.diff:  
       <header>
         <nav class="navbar navbar-default">
  -        <div class="container-fluid">
  +        <div class="container">
             <!-- Brand and toggle get grouped for better mobile display -->
             <div class="navbar-header">
               <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
  
positive.code:     </div>
  
      <%= javascript_include_tag "application" %>
    </body>
  </html>
  
negative.code: 
            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
              <%= form_tag '/search', :class => "navbar-form navbar-left", :role => "search", :method => "get" do %>
                <div class="form-group">
                  <input type="text" class="form-control" placeholder="Search">
                </div>
                <button type="submit" class="btn btn-default">Submit</button>
              <% end %>
              <ul class="nav navbar-nav navbar-right">
                <% if logged_in? %>
                  <li><%= link_to "Account", nil %></li>
  