const header_links = document.getElementById("header-links"); const hamburger = document.getElementById("header-links-toggle"); function toggle_header_links() { header_links.classList.toggle("open"); } document.addEventListener("click", event => { if (!header_links.contains(event.target) && !hamburger.contains(event.target)) { header_links.classList.remove("open"); } }); hamburger.addEventListener("click", event => { toggle_header_links(); });