Update extra.css

diff --git a/docs/_static/css/extra.css b/docs/_static/css/extra.css
index 7bb657e..d601923 100644 (file)
--- a/docs/_static/css/extra.css
+++ b/docs/_static/css/extra.css
@@ -49,7 +49,7 @@ span.mjpage__block > svg {
   text-align: unset !important;
 }
 
-.md-sidebar  {
+.md-sidebar--primary {
   z-index: 14 !important;
 }