Add Page Classes

add_classes.js

function checkWidth() {
  var iframeWidth = $(window).width();

  if (iframeWidth > 700) {
    $('body').addClass('is_timeline');
  } else {
    $('body').removeClass('is_timeline');
  }
};

// Event listener for resize
$(window).resize( function () {
   checkWidth();
});

// Call on load
$(document).ready( function () {
   checkWidth();
});