diff --git a/app/views/libraries/_form.html.erb b/app/views/libraries/_form.html.erb
index 6479eb8d..5326c38e 100644
--- a/app/views/libraries/_form.html.erb
+++ b/app/views/libraries/_form.html.erb
@@ -4,7 +4,7 @@
     <%= hidden_field_tag :apply_publish, false %>
     <div class="edu-back-white">
       <div class="padding30">
-        <div class="clearfix mb20">
+        <div class="clearfix">
           <span class="upload_Title">标题</span>
           <li class="fl">
             <%= f.text_field :title, placeholder: '例如：软件工程教学案例', class: 'greyInput winput-300-35 mr20 fl' %>