diff --git a/docs/assets/css/main.css b/docs/assets/css/main.css
index c4122e598..09517d4f6 100644
--- a/docs/assets/css/main.css
+++ b/docs/assets/css/main.css
@@ -38,5 +38,8 @@ figure.thumbnails img {
         figure.thumbnails img + img {
             margin: 0 0 0 1.5em;
         }
+        .medium-zoom-image {
+            z-index: 999;
+        }
     }
 }