協業切替画面が表示されたら閉じるボタンが表示されるように修正

public_new/css/collaboration.css

@@ -138,6 +138,10 @@
   transition: 0.3s;
   transition: 0.3s;
   background-image: url("../icon/icon_member_blue.png");
   background-image: url("../icon/icon_member_blue.png");
 }
 }
+.btn.menu_btn.hide {
+  transition: 0.3s;
+  background-image: url("../icon/icon_close.png");
+}
 .overlay {
 .overlay {
   transition: 0.7s;
   transition: 0.7s;
   position: absolute;
   position: absolute;