$( document ).ready(function() {
      $('#map-canvas').vectorMap({
          map: 'world_mill_en',
          series: {
              regions: [{
                  values: gdpData,
                  scale: ['#b0bec5'],
                  normalizeFunction: 'polynomial'
              }]
          },
          onRegionTipShow: function(e, el, code){
              el.html(el.html()+' (GDP - '+gdpData[code]+')');
          },
      markerStyle: {
        initial: {
          fill: '#ec407a',
          stroke: '#ec407a'
        }
      },
      markers: [
        {latLng: [42.5, 1.51], name: 'Andorra'},
        {latLng: [47.14, 9.52], name: 'Liechtenstein'},
        {latLng: [14.01, -60.98], name: 'Saint Lucia'},
        {latLng: [1.3, 103.8], name: 'Singapore'}
      ]
      });
      
      $('.jvectormap-zoomin').addClass('btn blue-grey');
      $('.jvectormap-zoomout').addClass('btn blue-grey');
  
  });