Override Wiki Editor max-height value

app/assets/stylesheets/pages/wiki.scss

@@ -151,3 +151,7 @@ ul.wiki-pages-list.content-list {
 .empty-state-wiki .text-content {
   max-width: 490px; // Widen to allow for the Confluence button
 }
+
+.wiki-form .markdown-area {
+  max-height: none;
+}