$(document).ready(function(){

  /*
  ** Toggle's body class
  ** change the CSS accordingly: body.menu-visible for a visible menu - body.menu-hidden for a hidden menu
  */
  function toggleMenu() {

    // Change the body class
    $('body').toggleClass('menu-visible menu-hidden');

  }

  // Bind click event to the hamburger button
  $('body').on('click', '.toggle-menu', toggleMenu);

});