diff --git a/chrome/content/zotero-platform/mac/zotero.css b/chrome/content/zotero-platform/mac/zotero.css
new file mode 100644
index 0000000000..cb8d0dca88
--- /dev/null
+++ b/chrome/content/zotero-platform/mac/zotero.css
@@ -0,0 +1,7 @@
+.zotero-advanced-options > .zotero-advanced-options-label > dropmarker {
+	transform: rotate(270deg) translateX(4px);
+}
+
+.zotero-advanced-options[state="open"] > .zotero-advanced-options-label > dropmarker {
+	transform: translateX(4px);
+}
\ No newline at end of file
diff --git a/chrome/content/zotero/feedSettings.xul b/chrome/content/zotero/feedSettings.xul
index 451b595e56..4e3fb3c929 100644
--- a/chrome/content/zotero/feedSettings.xul
+++ b/chrome/content/zotero/feedSettings.xul
@@ -1,6 +1,7 @@
 <?xml version="1.0"?>
 <?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
 <?xml-stylesheet href="chrome://zotero/skin/zotero.css" type="text/css"?>
+<?xml-stylesheet href="chrome://zotero-platform/content/zotero.css" type="text/css"?>
 <!DOCTYPE window [
 	<!ENTITY % zoteroDTD SYSTEM "chrome://zotero/locale/zotero.dtd" > %zoteroDTD;
 ]>