update

src/components/pages/classroomObservation/index.vue

@@ -99,7 +99,7 @@ export default {
   components: {
     chatArea,
     messageArea,
-    sharePdf
+    sharePdf,
 		addNewCourseDialog
   },
   data() {
@@ -297,9 +297,11 @@ export default {
   width: 20px;
   height: 20px;
   position: relative;
-  background: url("../../../assets/icon/classroomObservation/Zkicon.png")
+  background: url("../../../assets/icon/classroomObservation/close.png")
     no-repeat;
-  background-size: 100% 100%;
+	transform: rotate(45deg);
+	cursor: pointer;
+		background-size: 100% 100%;
 }
 .co-h2-l-hr {
   width: 2px;