diff --git a/_static/css/custom.css b/_static/css/custom.css
index f39a62380..60d15a28b 100644
--- a/_static/css/custom.css
+++ b/_static/css/custom.css
@@ -671,6 +671,7 @@ footer {
 }
 
 .wy-body-for-nav {
+    position: relative;
     background-color: var(--content-wrap-background-color);
 }