text: /*
  Reference: https://bootsnipp.com/snippets/featured/link-to-top-page
  */
  $(window).scroll(function () {
      if ($(this).scrollTop() > 50
          && $('#sidebar-trigger').css('display') == 'none') {
          $('#back-to-top').fadeIn();
      } else {
          $('#back-to-top').fadeOut();
      }
  });
  
  $(function () {
      $('#back-to-top').click(function () {
          $('body,html').animate({scrollTop: 0}, 800);
          return false;
      });
  });