diff --git a/public/react/src/modules/courses/new/CoursesNew.js b/public/react/src/modules/courses/new/CoursesNew.js
index 888f4c9e6..b817136ed 100644
--- a/public/react/src/modules/courses/new/CoursesNew.js
+++ b/public/react/src/modules/courses/new/CoursesNew.js
@@ -646,7 +646,7 @@ class CoursesNew extends Component {
                                     </Form.Item>
                                 </div>
 
-															<div className="stud-class-set padding10200 coursenavbox mb20">
+															<div className="stud-class-set padding10200 mb20">
 																<Form.Item label="课堂所属单位">
 																	{getFieldDecorator('school', {
 																		rules: [{required: true, message: "不能为空"}],