diff --git a/public/stylesheets/educoder/edu-all.css b/public/stylesheets/educoder/edu-all.css
index 543431c5..c2338d19 100644
--- a/public/stylesheets/educoder/edu-all.css
+++ b/public/stylesheets/educoder/edu-all.css
@@ -706,12 +706,12 @@ li.challenge_box:last-child{
 
 
 /*实践教学*/
-.second_course_1{min-height: 782px;}
+.second_course_1{min-height: 776px;}
 .second_course_2{min-height: 823px;}
 .second_course_3{min-height: 690px;}
-.second_course_4{min-height: 523px;}
+.second_course_4{min-height: 514px;}
 .second_course_5{min-height: 737px;padding-top: 190px;box-sizing: border-box;position: relative}
-.second_course_6{min-height: 1230px;}
+.second_course_6{min-height: 1225px;}
 .course_competition_panel{
     margin:30px 40px 40px;border:1px solid #ABDCF1;background: #F1F8FD;justify-content: center;align-items: center;display: -webkit-flex;
     height: 282px;text-align: center;