diff --git a/web/modules/custom/custom/custom.module b/web/modules/custom/custom/custom.module
index 1d9485398..709199abe 100644
--- a/web/modules/custom/custom/custom.module
+++ b/web/modules/custom/custom/custom.module
@@ -17,3 +17,13 @@ function custom_entity_type_build(array &$entityTypes): void {
     $entityTypes['node']->setClass(Node::class);
   }
 }
+
+/**
+ * Implements hook_preprocess_HOOK().
+ */
+function custom_preprocess_block(array &$variables): void {
+  // Add the 'markup' class to blocks.
+  if (in_array($variables['plugin_id'], ['views_block:featured_blog_posts-block_1'])) {
+    $variables['attributes']['class'][] = 'markup';
+  }
+}