text: var sideNav = document.querySelector('#side_nav');
  var sideNavButton = 
  
  
  
  function openNav() {
      $sideNav.toggle().width="100%";
  }
  function closeNav(){
      sideNav.style.width="0";
  }
  $("sidenav").click(function() {
      $("sideNav").toggle();
  });