Add anchor to links when browser window is less than 481 pixels

JavaScript
1

I’m new to javascript and jQuery and I’m trying to make it so that when site loads on a mobile device that I add an anchor link to each nav link. I want to do this because when you click on a new link you can’t tell if you are on the same page or not.

http://dev.newstartlaw.clients.blinkss.com/criminal-law/

Here is what I’ve done, but I can’t get it to work

$(document).ready(function(e) {

//retrieve window width
var width = $(window).css("width");

//Check to see if browser window is less than 481 pixels
if(width < 481px) {
	
//If the browser window is less than 481px then append #content to is	
$(".menu-mobile-main-container ul li a").append("#content2nd");


}

});

});