Css styling in a facebook app that are made in Ruby <HELP>

I help a friend out with a facebook app, that are made in ruby.
The problem is:

Basic styling with css is working ok..
But, we want to use html in it.. So we can make a more dynamic look on the game..

Is this possible? The whole system is weird. Only possible styling solution is a css file that works togheter with a layout position file.

Example of the app file:

<fb:fbml>
  <script>
    root_url = '<%= root_url(:canvas => false) %>';
  </script>

  <%= editable_stylesheet_link %>

  <% if Rails.env.development? %>
    <script>
      <%= raw File.read(File.join(RAILS_ROOT, "public", "javascripts", "facebooker.js")) %>

      <%= raw File.read(File.join(RAILS_ROOT, "public", "javascripts", "application.js")) %>
    </script>
  <% else %>
    <%= javascript_include_tag "facebooker", "application" %>
  <% end %>

  <%= render :partial => "layouts/admin/main_menu" %>

  <div id="content">
    <div id="header">
      

      <%= render :partial => "layouts/main_menu" %>
	  <%= link_to("&nbsp;", root_path, :id => :logo) %>
	  <%= render :partial => "layouts/bottom_menu" %>
      <%= render :partial => "layouts/character_overview" %>
      <%= render(:partial => "layouts/tip") if current_user.show_tips? %>
    </div>

    <% flash_block do |message| %>
      <%= fb_i(message) %>
    <% end %>

    <input type="text" style="width: 1px; height: 1px; border:0px;" id="top_field"/>
    
    <%= render :partial => "layouts/spinner" %>

    <%= content_tag(:div, yield(:result), :id => :result, :style => ("display:none" if @content_for_result.blank?)) %>

    <%= render "tutorials/block" if current_user.show_tutorial? %>

    <%= yield %>
  </div>

  <script><%= yield :script %></script>
  
  <%= fb_google_analytics(Configuration[:app_google_analytics_id]) unless Configuration[:app_google_analytics_id].blank? %>
</fb:fbml>

Code (markup):

Help on this is preciated!

-Thomas