diff --git a/doc_src/python_docs_theme/static/pydoctheme.css b/doc_src/python_docs_theme/static/pydoctheme.css
index 161c96c51..ac0ca196b 100644
--- a/doc_src/python_docs_theme/static/pydoctheme.css
+++ b/doc_src/python_docs_theme/static/pydoctheme.css
@@ -333,7 +333,7 @@ kbd {
   padding: 0.1em 0.3em;
 }
 
-.footnote {
+.footnote, .footnote-reference {
     background-color: #ddddea;
     font-size: 90%;
 }