diff --git a/doc/doxygen.css b/doc/doxygen.css
index cab3828e2..e7b24f727 100644
--- a/doc/doxygen.css
+++ b/doc/doxygen.css
@@ -905,5 +905,5 @@ dl.bug
 /* end NEW */
 
 #nav-tree {
-	background: black;
+	background: black !important;
 }