diff --git a/skin/osx/osx.css b/skin/osx/osx.css
index 2d7eb0d..918fa14 100644
--- a/skin/osx/osx.css
+++ b/skin/osx/osx.css
@@ -12,6 +12,10 @@
     height: 44px !important;
 }
 
+#titlebar {
+  background: var(--chrome-background-color);
+}
+
 .tabbrowser-tabs {
     margin: 0 !important;
     padding: 0 !important;