How to add Google map in your site?

</div id="map"></div>

#map{
  display: block;
  width: 100%;
  height: 350px;
  margin: 0 auto;
  -moz-box-shadow: 0px 5px 20px #ccc;
  -webkit-box-shadow: 0px 5px 20px #ccc;
  box-shadow: 0px 5px 20px #ccc;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script>
<script src="<?php echo get_template_directory_uri(); ?>/js/prettify.js"></script>
<script type="text/javascript">
     var map;
     jQuery(document).ready(function(){
          prettyPrint();
          map = new GMaps({
          div: '#map',
          lat: 35.7333286,
          lng: 140.8232659,
          });
          //If you want to addMarker you need to call prettify.ja
          map.addMarker({
               lat: 35.7333286,
               lng: 140.8232659,
          });
     });
</script>