Merge branch 'feature/42989_close_button_on_change_collaboration' into 'develop'

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

See merge request !151

public_new/css/collaboration.css

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