diff --git a/chrome/skin/default/zotero/overlay.css b/chrome/skin/default/zotero/overlay.css
index 2cf661c982..6fd0d5b2cb 100644
--- a/chrome/skin/default/zotero/overlay.css
+++ b/chrome/skin/default/zotero/overlay.css
@@ -158,6 +158,7 @@
 	position: absolute;
 	top: 0;
 	left: 0;
+	font-size: .7em;
 }
 
 .items-tree-message div {