课程资源列表增加5个像素间隔

app/views/files/_course_list.html.erb

@@ -44,7 +44,7 @@
               <% end %>
             </div>
             <div class="cl"></div>
-            <div class="">
+            <div class="mt5">
               <p class="f_l mb5 c_grey02">文件大小：<%= number_to_human_size(file.filesize) %></p>
               <%= link_to( l(:button_delete), attachment_path(file),
                            :data => {:confirm => l(:text_are_you_sure)}, :method => :delete,:class => "f_r re_de") if delete_allowed && file.container_id == @course.id && file.container_type == "Course"%>