$(document).ready(function() {
						   
	var currentSize = 100;
	
		$("#increase").click(function() {
		    if(currentSize <= 115) {
				var increasedSize = currentSize + 5;
				var sizeString = increasedSize + "%";
				$("body").css("font-size",sizeString);
				currentSize = increasedSize;
			};
		});
		
		$("#decrease").click(function() {
		    if(currentSize >= 85) {
				var decreasedSize = currentSize - 5;
				var sizeString = decreasedSize + "%";
				$("body").css("font-size",sizeString);
				currentSize = decreasedSize;
			};
		});
						   
});