diff --git a/doc_src/python_docs_theme/static/pydoctheme.css b/doc_src/python_docs_theme/static/pydoctheme.css
index 6866911f8..ea1a1ac34 100644
--- a/doc_src/python_docs_theme/static/pydoctheme.css
+++ b/doc_src/python_docs_theme/static/pydoctheme.css
@@ -352,7 +352,7 @@ div.body h1, div.body h2, div.body h3, div.body h4, div.body h5, div.body h6 {
     padding: 0.3em 0;
 }
 
-div.body h3 {
+div.body h3, div.body h4 {
   font-size: 140%;
 }