diff --git a/config/mkdocs-common.yml b/config/mkdocs-common.yml
index 2174e83ace..424a59c236 100644
--- a/config/mkdocs-common.yml
+++ b/config/mkdocs-common.yml
@@ -93,7 +93,7 @@ theme:
     - search.highlight
 
 extra_css:
-  - assets/stylesheets/extra.css?v=3.15.0
+  - assets/stylesheets/extra.css?v=3.17.0
 extra_javascript:
   - assets/javascripts/mathjax.js
 
diff --git a/theme/assets/stylesheets/extra.css b/theme/assets/stylesheets/extra.css
index bf5dddd626..5c0eb6aa76 100644
--- a/theme/assets/stylesheets/extra.css
+++ b/theme/assets/stylesheets/extra.css
@@ -501,4 +501,5 @@ path[d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-
     left: 50%;
     transform: translate(-50%, -50%);
     color: white;
+    z-index: 1;
 }