Prevent last section from extending beyond footer

When the last section does not use full height, depending on its
transition settings, its backdrop can still have full viewport
height. This can cause the document to expand vertically resulting in
empty space below the footer.

REDMINE-20872

entry_types/scrolled/package/src/frontend/Content.module.css

@@ -1,5 +1,6 @@
 .Content {
   font-family: var(--theme-entry-font-family);
+  overflow: clip;
 }
 
 @media screen {