$(document).ready(function() {
  	$('em').each(function() {
	            this.innerHTML = '<span class="white-background">'+ this.innerHTML +'</span>';
	});
	$('.menu-sub-category-header').each(function() {
	            this.innerHTML = '<span class="white-background">'+ this.innerHTML +'</span>';
	});
	$('.sub-header').each(function() {
	            this.innerHTML = '<span class="white-background">'+ this.innerHTML +'</span>';
	});
});