document.addEventListener('DOMContentLoaded', function () {
  // Get all "navbar-burger" elements
  var $navbarBurgers = Array.prototype.slice.call(document.querySelectorAll('.navbar-burger'), 0);
  // Check if there are any navbar burgers
  if ($navbarBurgers.length > 0) {
    // Add a click event on each of them
    $navbarBurgers.forEach(function ($el) {
      $el.addEventListener('click', function () {
        // Get the "main-nav" element
        var $target = document.getElementById('main-nav');
        // Toggle the class on "main-nav"
        $target.classList.toggle('hidden');
      });
    });
  }
});