diff --git a/build/style.css b/build/style.css
index 79f8bff..a8e3cd1 100644
--- a/build/style.css
+++ b/build/style.css
@@ -158,6 +158,7 @@ h2.collectingheader {
   position: sticky;
   top: 0;
   background-color: Canvas;
+  z-index: 100;
 }
 
 p img {