diff --git a/app/views/layouts/_logined_header.html.erb b/app/views/layouts/_logined_header.html.erb
index 07348fc2..66fc345d 100644
--- a/app/views/layouts/_logined_header.html.erb
+++ b/app/views/layouts/_logined_header.html.erb
@@ -1,5 +1,5 @@
 <%= link_to image_tag("/images/educoder/headNavLogo.png", alt:"高校智能化教学与实训平台", class:"logoimg fl ml25 mr60"), home_path %>
-<div class="educontent">
+<div class="educontents fl">
 
   <div class="head-nav pr">
     <ul id="header-nav">
diff --git a/app/views/layouts/_unlogin_header.html.erb b/app/views/layouts/_unlogin_header.html.erb
index 2ced69b8..2e12a992 100644
--- a/app/views/layouts/_unlogin_header.html.erb
+++ b/app/views/layouts/_unlogin_header.html.erb
@@ -1,7 +1,7 @@
 
 <%= link_to image_tag("/images/educoder/headNavLogo.png", alt:"高校智能化教学与实训平台", class:"logoimg fl ml25 mr60 "), home_path %>
 
-<div class="educontent">
+<div class="educontents fl">
 
   <div class="head-nav pr">
     <ul id="header-nav">
diff --git a/public/stylesheets/educoder/edu-main.css b/public/stylesheets/educoder/edu-main.css
index 87fd616b..705f23e6 100644
--- a/public/stylesheets/educoder/edu-main.css
+++ b/public/stylesheets/educoder/edu-main.css
@@ -191,6 +191,7 @@ input::-ms-clear{display:none;}
 
 .newContainer{ min-height:100%; height: auto !important; height: 100%; /*IE6不识别min-height*/position: relative;}
 .educontent{width: 1200px;margin:0px auto;box-sizing: border-box}/*中间部分宽度固定为1200*/
+.educontents{margin:0px auto;box-sizing: border-box}/*中间部分宽度固定为1200*/
 .newMain{ margin: 0 auto; padding-bottom: 235px; min-width:1200px;padding-top: 60px}/*padding-bottom根据底部的高度而定*/
 .newMain{ padding-bottom: 110px !important; }