diff --git a/addons/mail/static/src/css/mail.css b/addons/mail/static/src/css/mail.css
index 653f71fc040..43c9c54afd0 100644
--- a/addons/mail/static/src/css/mail.css
+++ b/addons/mail/static/src/css/mail.css
@@ -20,6 +20,11 @@
     margin-left: 5%;
 }
 
+.oe_mail_wall_thread_content div.oe_mail_thread_act .oe_mail_action_textarea {
+    width: 100%;
+    height: 20px;
+    padding: 2px;
+}
 
 /* Thread */
 
@@ -110,7 +115,7 @@
 }
 
 .oe_mail_action_textarea {
-    width: 60%;
+    width: 80%;
     height: 50px;
     padding: 5px;
 }