Modification in Design structure_css -> default_css

app/views/admin/designs/_form.html.erb

@@ -30,9 +30,12 @@
 <p>
 	<%= f.label "default_css", t('admin.default_css') %>
 	<% if @design.default_css.blank? %>
-	    <%= f.file_field :default_css %>
+		<%= fields_for 'design[default_css]' do |f| %>
+	    <%= f.file_field :file %>
+			<%= f.hidden_field :to_save, :value => true %>
+		<% end %>
 	<% else %>
-	  <%= File.basename (@design.default_css.url) %>
+	  <%= File.basename (@design.default_css.file.url) %>
 	<% end %> 
 </p>
 <p>