fix toc

assets/sass/_theme/design-system/table_of_contents.sass

@@ -149,11 +149,13 @@
         left: auto
         .toc-content
             position: relative
-            top: 0
+            top: 0 !important
             max-height: none
             padding-bottom: 0
             margin-top: 0
             margin-bottom: 0
+            html.is-scrolling-down &
+                max-height: none
 
 .toc-title, .toc-cta, .toc-container button
     font-family: $toc-title-font-family