Merge branch 'feature/yuananting/20210602/replace-defaul-cover' into dev

src/modules/teach-tool/paper-manage/OperatePaper.less

@@ -102,6 +102,9 @@
         border: none !important;
         border: none !important;
       }
       }
     }
     }
+    .ant-table-tbody > tr:hover:not(.ant-table-expanded-row):not(.ant-table-row-selected) > td {
+      background: #F7F8F9 !important;
+    }
   }
   }
 }
 }