clean install

web/themes/gin/dist/js/sticky.js

@@ -0,0 +1,17 @@
+(Drupal => {
+  Drupal.behaviors.ginSticky = {
+    attach: context => {
+      once("ginSticky", ".region-sticky-watcher").forEach((() => {
+        const observer = new IntersectionObserver((_ref => {
+          let [e] = _ref;
+          const regionSticky = context.querySelector(".region-sticky");
+          regionSticky.classList.toggle("region-sticky--is-sticky", e.intersectionRatio < 1), 
+          regionSticky.toggleAttribute("data-offset-top", e.intersectionRatio < 1), Drupal.displace(!0);
+        }), {
+          threshold: [ 1 ]
+        }), element = context.querySelector(".region-sticky-watcher");
+        element && observer.observe(element);
+      }));
+    }
+  };
+})(Drupal);