Floating sidebar next to <% yield %>

I'm trying to float a sidebar nav as a partial in my rails app. Here is the relevant part of my application layout:

<body>
  <%= render 'layouts/header' %>
      <% flash.each do |name, msg| %>
      <%= content_tag :div, msg, :id => "flash_#{name}" %>
      <% end %>
  <%= render 'layouts/sidebar' %>
    <div class="container">
      <%= yield %>
      <%= render 'layouts/footer' %>
    </div>

</body>

I'm using Twitter bootstrap in this app, fyi. I expected this to render above <% yield %>, but I can't figure out how to render the sidebar floating next to yield. How can I do this? I have not applied any custom css to the sidebar yet. I have applied class of "sidebar-nav-fixed" to the div containing the sidebar content. Thanks in advance!

Solution

Please have a look at http://twitter.github.io/bootstrap/scaffolding.html#fluidGridSystem. May be something like this would work:

<body>
  <%= render 'layouts/header' %>
      <% flash.each do |name, msg| %>
      <%= content_tag :div, msg, :id => "flash_#{name}" %>
      <% end %>
    <div class="container">
      <div class="row-fluid">
          <div class="span4"><%= render 'layouts/sidebar' %></div>
          <div class="span8"><%= yield %></div>
      </div>
      <%= render 'layouts/footer' %>
    </div>
</body>