function toggleMenu() {
  var menuList = document.getElementsByClassName("menu-list")[0];
  var menuButton = document.getElementById("menu-btn");
  if (menuList.classList.contains("active")) {
    menuList.classList.remove("active");
    menuButton.innerHTML = "Menu";
  } else {
    menuList.classList.add("active");
    menuButton.innerHTML = "<div class=\"icon arrow-up\"> </div>";
  }
}