Update website

main.js

@@ -158,3 +158,12 @@ mobileMenuQuery.addEventListener('change', () => {
   });
   closeMobileMenus();
 });
+
+function updateScrolledHeaders() {
+  document.querySelectorAll('.site-header').forEach((header) => {
+    header.classList.toggle('is-scrolled', window.scrollY > 20);
+  });
+}
+
+updateScrolledHeaders();
+window.addEventListener('scroll', updateScrolledHeaders, { passive: true });