diff --git a/tests_hugo/chat_node/chat_client/style/layout_new.css b/tests_hugo/chat_node/chat_client/style/layout_new.css
index 96652f49..63ba718a 100644
--- a/tests_hugo/chat_node/chat_client/style/layout_new.css
+++ b/tests_hugo/chat_node/chat_client/style/layout_new.css
@@ -21,6 +21,7 @@
 	pointer-events: none;
 }
 
+/* add or remove '.chat_item' to toggle the hover effect */
 #chat_box.new .chat_item button {
 	margin: 0px;
 	background-color: transparent;
@@ -30,4 +31,9 @@
 	margin: 10px 0px;
 }
 
+/*
+				<div id="chat_api_publics_rooms" class="chat_api">
+					<button class="chat_room_name" onclick="layout('room')">
+						<p class="__left">join room</p>
+*/