diff --git a/_static/css/custom.css b/_static/css/custom.css
index 6cbf9606c..60ba496bc 100644
--- a/_static/css/custom.css
+++ b/_static/css/custom.css
@@ -668,6 +668,7 @@ footer {
 }
 
 .wy-body-for-nav {
+    position: relative;
     background-color: var(--content-wrap-background-color);
 }