text: var navToggle = document.getElementById("nav-toggle");
  var navTarget = navToggle.nextElementSibling;
  
  // show toggle
  navToggle.classList.remove("invisible");
  
  // hide nav
  navTarget.setAttribute("data-expanded", "false");
  
  // toggle nav
  navToggle.onclick = function() {
    let expanded = navToggle.getAttribute('aria-expanded') === 'true' || false;
    navToggle.setAttribute('aria-expanded', !expanded);
    navTarget.setAttribute("data-expanded", !expanded);
  }
  