// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file. JavaScript code in this file should be added after the last require_* statement.
//
// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require jquery_ujs
//= require turbolinks
//= require_tree .

$(function() {

  $(window).on("scroll", function() {
    if($(window).scrollTop() > 50) {
        $("#nav").addClass("active");
    } else {
        //remove the background property so it comes transparent again (defined in your css)
       $("#nav").removeClass("active");
    }
  });
  
});
// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file. JavaScript code in this file should be added after the last require_* statement.
//
// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require jquery
//= require jquery_ujs
//= require turbolinks
//= require_tree .

$(function() {

  $(window).on("scroll", function() {
    if($(window).scrollTop() > 110) {
        $("#nav").addClass("active");
    } else {
        //remove the background property so it comes transparent again (defined in your css)
       $("#nav").removeClass("active");
    }
  });

});
Update nav background-color change from 50px to 110px trigger
Update nav background-color change from 50px to 110px trigger
