var is_iphone = (navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i));
var is_ipad = (navigator.userAgent.match(/iPad/i));
var is_android = (navigator.userAgent.match(/Android/i))
var is_mobile = is_iphone || is_ipad || is_android;
$(function() {
  if (is_mobile) {
    $("html").addClass("mobile");
  } else {
    $("html").addClass("desktop");
  }
});