课程班级列表的“加入班级”样式调整

app/views/syllabuses/_syllabus_course_list.html.erb

@@ -62,7 +62,7 @@
             <% if User.current.member_of_course?(course) %>
                 <%=link_to '进入班级', course_path(course), :class => 'btn_orange_big fr mt5', :target => '_blank' %>
             <% else %>
-                <%= link_to "加入班级",join_private_courses_courses_path,:remote => true,:class => "btn_green_big fr mt5",:method => "post"%>
+                <%= link_to "加入班级",join_private_courses_courses_path,:remote => true,:class => "hw_btn_green2 fr mt5",:method => "post"%>
             <% end %>
             <div class="cl"></div>
           </ul>