--- a/mail/themes/qute/mail/primaryToolbar-aero.css
+++ b/mail/themes/qute/mail/primaryToolbar-aero.css
@@ -518,16 +518,21 @@ toolbox[labelalign="end"] > toolbar[mode
   -moz-image-region: rect(1px, 395px, 17px, 379px);
 }
 
 #button-chat[unreadMessages="true"] {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar.png");
   -moz-image-region: rect(19px, 395px, 35px, 379px);
 }
 
+toolbar:not([mode="text"]) > #button-chat > stack,
+toolbar:not([mode="text"]) > toolbarpaletteitem > #button-chat > stack {
+  margin: 1px;
+}
+
 toolbar[iconsize="large"]:not([mode="text"]) .badgeButton-badge {
   -moz-margin-start: 6px;
   margin-bottom: 6px;
 }
 
 #button-nextMsg {
   list-style-image: url("chrome://messenger/skin/icons/mail-toolbar.png");
   -moz-image-region: rect(1px, 413px, 17px, 397px);