修复课程首页当前学校课程数为9时，页面显示有问题

app/views/welcome/_course_list.html.erb

@@ -1,5 +1,5 @@
 <% course_list.map do |course| %>
-    <li class='<%= cycle("odd", "even") %>' title=<%= course.description.to_s.gsub(/<\/?.*?>/,"") %>>
+    <li class='<%= cycle("odd", "even") %>' title="<%= course.description.to_s.gsub(/<\/?.*?>/,'') %>"  style="min-height: 69px;">
       <div class='avatar'>
         <%= image_tag(get_course_avatar(course), :class => "avatar-4") %>
       </div>