diff --git a/addons/im_livechat/static/src/less/im_livechat.less b/addons/im_livechat/static/src/less/im_livechat.less
index c57bfad230a..c52fc7d2b9e 100644
--- a/addons/im_livechat/static/src/less/im_livechat.less
+++ b/addons/im_livechat/static/src/less/im_livechat.less
@@ -16,6 +16,7 @@
     border-bottom: 0px;
     border-top-left-radius: 5px;
     border-top-right-radius: 5px;
+    z-index: 5;
 }
 
 .o_chat_window {