diff --git a/app/views/courses/_course_activity.html.erb b/app/views/courses/_course_activity.html.erb
index b79964a8d..4a7cb900d 100644
--- a/app/views/courses/_course_activity.html.erb
+++ b/app/views/courses/_course_activity.html.erb
@@ -76,11 +76,13 @@
                 }
                 $("#intro_content_show_<%= activity.id %>").click(function(){
                     $("#activity_description_<%= activity.id %>").toggleClass("maxh360");
+                    $("#activity_description_<%= activity.id%>").toggleClass("lh18");
                     $("#intro_content_show_<%= activity.id %>").hide();
                     $("#intro_content_hide_<%= activity.id %>").show();
                 });
                 $("#intro_content_hide_<%= activity.id %>").click(function(){
                     $("#activity_description_<%= activity.id %>").toggleClass("maxh360");
+                    $("#activity_description_<%= activity.id%>").toggleClass("lh18");
                     $("#intro_content_hide_<%= activity.id %>").hide();
                     $("#intro_content_show_<%= activity.id %>").show();
                 });
diff --git a/app/views/users/_user_activities.html.erb b/app/views/users/_user_activities.html.erb
index a9584c80e..b7981bdbc 100644
--- a/app/views/users/_user_activities.html.erb
+++ b/app/views/users/_user_activities.html.erb
@@ -44,11 +44,13 @@
                 }
                 $("#intro_content_show_<%= user_activity.id %>").click(function(){
                     $("#activity_description_<%= user_activity.id %>").toggleClass("maxh360");
+                    $("#activity_description_<%= user_activity.id%>").toggleClass("lh18");
                     $("#intro_content_show_<%= user_activity.id %>").hide();
                     $("#intro_content_hide_<%= user_activity.id %>").show();
                 });
                 $("#intro_content_hide_<%= user_activity.id %>").click(function(){
                     $("#activity_description_<%= user_activity.id %>").toggleClass("maxh360");
+                    $("#activity_description_<%= user_activity.id%>").toggleClass("lh18");
                     $("#intro_content_hide_<%= user_activity.id %>").hide();
                     $("#intro_content_show_<%= user_activity.id %>").show();
                 });
diff --git a/app/views/users/_user_homework_list.html.erb b/app/views/users/_user_homework_list.html.erb
index ee3e05795..2e530d489 100644
--- a/app/views/users/_user_homework_list.html.erb
+++ b/app/views/users/_user_homework_list.html.erb
@@ -21,11 +21,13 @@
             }
             $("#intro_content_show_<%= homework_common.id%>").click(function(){
                 $("#homework_description_<%= homework_common.id%>").toggleClass("maxh360");
+                $("#homework_description_<%= homework_common.id%>").toggleClass("lh18");
                 $("#intro_content_show_<%= homework_common.id%>").hide();
                 $("#intro_content_hide_<%= homework_common.id%>").show();
             });
             $("#intro_content_hide_<%= homework_common.id%>").click(function(){
                 $("#homework_description_<%= homework_common.id%>").toggleClass("maxh360");
+                $("#homework_description_<%= homework_common.id%>").toggleClass("lh18");
                 $("#intro_content_hide_<%= homework_common.id%>").hide();
                 $("#intro_content_show_<%= homework_common.id%>").show();
             });