diff --git a/doc/en/_themes/flask/static/flasky.css_t b/doc/en/_themes/flask/static/flasky.css_t
index ffa258bfc..9c5fd9526 100644
--- a/doc/en/_themes/flask/static/flasky.css_t
+++ b/doc/en/_themes/flask/static/flasky.css_t
@@ -481,7 +481,7 @@ a:hover tt {
     }
 
     div.sphinxsidebar h3, div.sphinxsidebar h4, div.sphinxsidebar p,
-    div.sphinxsidebar h3 a {
+    div.sphinxsidebar h3 a, div.sphinxsidebar ul {
         color: white;
     }