fix:优化样式

src/modules/course-manage/components/AddLiveIntro.jsx

 /*
  * @Author: 吴文洁 
  * @Date: 2020-07-16 11:05:17 
- * @Last Modified by: mikey.zhaopeng
- * @Last Modified time: 2020-11-24 14:29:52
+ * @Last Modified by: chenshu
+ * @Last Modified time: 2021-03-23 16:34:11
  * @Description: 添加直播-简介
  */
 
@@ -195,7 +195,7 @@ class AddLiveIntro extends React.Component {
                 </Col>
               </Row>
               <Row>
-                <Col span={8}>
+                <Col span={24}>
                   <Radio value="NO">
                     手动录制
                     <span className="playback__text">讲师手动选择何时开始录制</span>