diff --git a/addons/mail/static/src/less/mail_chat_backend.less b/addons/mail/static/src/less/mail_chat_backend.less
index fb9b4202115..f93d1ed2448 100644
--- a/addons/mail/static/src/less/mail_chat_backend.less
+++ b/addons/mail/static/src/less/mail_chat_backend.less
@@ -122,7 +122,7 @@
 
         .o_mail_chat_composer_wrapper {
             border-top: 1px solid @gray-lighter;
-            background-color: @gray-lighter;
+            background-color: #21b799;
         }
     }
 }