diff --git a/docs/doxygen/doxygen.cfg b/docs/doxygen/doxygen.cfg
index 1f0b160498..b393ea8ac6 100644
--- a/docs/doxygen/doxygen.cfg
+++ b/docs/doxygen/doxygen.cfg
@@ -1393,6 +1393,7 @@ HTML_STYLESHEET        =
 
 HTML_EXTRA_STYLESHEET  = awesome_css/doxygen-awesome.css \
                          awesome_css/doxygen-awesome-sidebar-only.css \
+                         awesome_css/doxygen-awesome-sidebar-only-darkmode-toggle.css \
                          ../assets/css/cards.css \
                          ../assets/css/flow.css \
                          ../assets/css/p4c_custom.css \