text: // navigation menu overlay toggle
  function openNav() {
      document.getElementById("myNav").classList.toggle("menu_width");
      document.querySelector(".custom_menu-btn").classList.toggle("menu_btn-style");
  }
  
  // to get current year
  function getYear() {
      var currentDate = new Date();
      var currentYear = currentDate.getFullYear();
      document.querySelector("#displayYear").innerHTML = currentYear;
  }
  
  getYear();
  
  
  
  /** google_map js **/
  
  function myMap() {
      var mapProp = {
          center: new google.maps.LatLng(40.712775, -74.005973),
          zoom: 18
      };
      var map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
  }