(function (){
    var u = navigator.userAgent,
        w = window.innerWidth;
    if (!u.match(/AppleWebKit.*Mobile.*/) || u.indexOf('iPad') > -1) {
        var sw = w*576/1920;
        window.innerWidth = sw<375?375:sw;
                window.onload = function() {
                window.innerWidth = w;
            }
    }
})();