diff --git a/contrib/mkdocs/mkdocs.yml b/contrib/mkdocs/mkdocs.yml
index 30239b45ef..b2ac0a95b9 100644
--- a/contrib/mkdocs/mkdocs.yml
+++ b/contrib/mkdocs/mkdocs.yml
@@ -32,7 +32,8 @@ theme:
     - navigation.indexes
     - search.highlight
     - search.share
-
+extra_css:
+  - stylesheets/extra.css
 use_directory_urls: false
 markdown_extensions:
     - smarty