Double the gap above the pinned post, per Avrumi's rigorous spec

assets/stylesheets/topic-footer-message.scss

@@ -69,7 +69,7 @@
 // The pinned post renders as a regular post at the bottom of the topic
 // (right after the post stream), not as a footer banner.
 .topic-footer-pinned-post {
-  margin: 2em 0 0;
+  margin: 4em 0 0;
   padding: 1em 1.25em;
   border: 1px solid var(--primary-low);
   border-radius: var(--d-border-radius, 0.25em);