Show Map by Address with Google Maps API, and change custom marker

functions.js

/*=======================================
=            Google Maps API            =
=======================================*/

var geocoder;
var map;
var address = location_address;

function initialize() {
  geocoder = new google.maps.Geocoder();
  //var latlng = new google.maps.LatLng(-34.397, 150.644);
  var myOptions = {
    zoom: 16, 
    //center: latlng,
    mapTypeControl: true,
    mapTypeControlOptions: {
      style: google.maps.MapTypeControlStyle.DROPDOWN_MENU
    },
    navigationControl: true,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  map = new google.maps.Map(document.getElementById("qwp_map_canvas"), myOptions);
  var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';

  if (geocoder) {
    geocoder.geocode({
      'address': address
    }, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
        if (status != google.maps.GeocoderStatus.ZERO_RESULTS) {
          map.setCenter(results[0].geometry.location);

          // Recuperando a latitude e longitude do endereço definido
          //var latitude = results[0].geometry.location.lat();
          //var longitude = results[0].geometry.location.lng();

          var infowindow = new google.maps.InfoWindow({
            content: '<b>' + address + '</b>',
            size: new google.maps.Size(150, 50)
          });

          var marker = new google.maps.Marker({
            position: results[0].geometry.location,
            map: map,
            title: address,
            icon: template_uri + "/assets/img/map-marker.png",
          });
          google.maps.event.addListener(marker, 'click', function() {
            infowindow.open(map, marker);
          });

        } else {
          alert("No results found");
        }
      } else {
        alert("Geocode was not successful for the following reason: " + status);
      }
    });
  }
}

google.maps.event.addDomListener(window, 'load', initialize);

/*=====  End of Google Maps API  ======*/

index.html

<script type='text/javascript' src='http://maps.google.com/maps/api/js?sensor=false&#038;ver=4.6.1'></script>
<div id="qwp_map_canvas"></div>

style.css

#qwp_map_canvas{
  width: 100%;
  height: 400px;
  }