opButton && topnavList) {
      topButton.addEventListener("click", function (e) {
        topnavList
          .classList
          .toggle("hidden");
        e.stopPropagation();
      });
      document.addEventListener("click", function (e) {
        // if the clicked element isn't the list, close the list
        if (!topnavList.classList.contains("hidden") && !e.target.closest("#topnavList")) {
          topButton.click();
        }
      });

      // set active <a> element
      var url = window
   