diff --git a/public/stylesheets/courses.css b/public/stylesheets/courses.css
index faffee4d1..00aff2195 100644
--- a/public/stylesheets/courses.css
+++ b/public/stylesheets/courses.css
@@ -64,7 +64,7 @@ a:hover.news_foot{ color:#787b7e; border:1px solid #d4d4d4;}
 a.hworkExport {background:url(../images/homepage_icon2.png) -10px -401px no-repeat; padding-left:23px;}
 a.hworkSetting {background:url(../images/homepage_icon2.png) -10px -450px no-repeat; padding-left:23px;}
 .hworkInfor {font-size:12px; color:#269ac9; width:80px; height:40px; vertical-align:middle; float:left; line-height:40px; text-align:center; font-weight:bold;}
-.infoNi{ width:100px; padding:5px;-moz-border-radius:3px;  -webkit-border-radius:3px;  border-radius:3px; box-shadow:0px 0px 5px #194a81; color:#666; background:#fff; text-align:left; line-height:2; position:absolute; margin-top:-24px;margin-left: 40px;}
+.infoNi{ width:100px; padding:5px;-moz-border-radius:3px;  -webkit-border-radius:3px;  border-radius:3px; box-shadow:0px 0px 5px #194a81; color:#666; background:#fff; text-align:left; line-height:2; position:absolute; margin-top:-24px;margin-left: 40px; z-index:99;}
 .problemTxt {width:660px; margin-left:10px; color:#777777; position:relative;}
 .rTxtTit{width:560px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis;color:#15bccf; float:left; color:#269ac9; font-size:14px;}
 .hworkSearchBox {border:1px solid #e6e6e6; width:185px; float:left; background-color:#ffffff;}