diff --git a/mail/themes/pinstripe/mail/preferences/preferences.css b/mail/themes/pinstripe/mail/preferences/preferences.css
index e91d8691465..751c9196b6c 100644
--- a/mail/themes/pinstripe/mail/preferences/preferences.css
+++ b/mail/themes/pinstripe/mail/preferences/preferences.css
@@ -155,11 +155,8 @@ radio[pane=paneAdvanced]:active {
 }
 
 prefpane .groupbox-body {
-  border: none !important;
-  -moz-border-radius: 0px !important;
-  background-image: none !important;
+  -moz-appearance: none;
   padding: 8px 4px 4px 4px;
-
 }
 
 #paneTabs > groupbox {