Add LHB Engineering case study with reusable header/footer partials and scrollable hero screenshots

js/screenshot-scroll-hint.js

@@ -0,0 +1,13 @@
+document.querySelectorAll('.screenshot-hero-scroll').forEach(function (el) {
+    var img = el.querySelector('img');
+    function check() {
+        if (el.scrollHeight <= el.clientHeight) {
+            el.classList.add('screenshot-hero-scroll--no-hint');
+        }
+    }
+    if (img && !img.complete) {
+        img.addEventListener('load', check);
+    } else {
+        check();
+    }
+});