diff --git a/UI/WebServerResources/MailerUI.css b/UI/WebServerResources/MailerUI.css
index 6d06ee514..ae6d88257 100644
--- a/UI/WebServerResources/MailerUI.css
+++ b/UI/WebServerResources/MailerUI.css
@@ -85,9 +85,11 @@ DIV#folderTreeContent
   position: absolute;
   color: #000;
   background: #fff;
-  width: 100%;
+  width: auto;
   top: 2em;
   bottom: 0px;
+  left: 0px;
+  right: 0px;
   overflow: auto; }
 
 #label-menu LI.label1