!(function(win, doc) {
   	function setFontSize() {
   		var docEl = doc.documentElement;
   		var winWidth = docEl.clientWidth;
   		doc.documentElement.style.fontSize = (winWidth / 375) * 10 + 'px';
   	}
   	var userAgent = navigator.userAgent;
	win.addEventListener('resize', function() {
   		if (navigator.userAgent !== userAgent) {
   			location.reload();
   		}
   	}) 
	setFontSize();
   }(window, document));