How can I make my infobox on cartodb close when I click outside of it or any part of my basemap?

How can I make my infobox on cartodb close when I click outside of it or any part of my basemap. I do not want it to close when I click the closing button on the top right corner of the infobox. I am looking for a code I can add to my script or anything that might help.

      var map;
      var google_api_key = "ljkjGcnvIaN-4HXq45A7Q-HD"
      function main() {
        //var google_api_key = "ljkjGcnvIaN-4HXq45A7Q-HD"

          // Map center
          var myLatlng = new google.maps.LatLng(42.358, -71.07);
          var myOptions = {
            zoom: 14,
            center: myLatlng, 
            disableDefaultUI: true,
            zoomControl: true,
            mapTypeId: google.maps.MapTypeId.ROADMAP
          }
          // Render basemap
          map = new google.maps.Map(document.getElementById("map"), myOptions);

          map.set('styles', [
            {
                        featureType: "road",
                        elementType: "geometry",
                        stylers: [
                          { visibility: "on" }
                        ]
                      },
                      {
                        featureType: "road.highway",
                        elementType: "geometry",
                        stylers: [
                          { lightness: 100 },
                        ]
                      },
                      {
                        featureType: "road",
                        elementType: "labels",
                        stylers: [
                          { lightness: 20},
                           {visibility: "off"  }

                        ]
                      },
                      {
                        featureType: "road.highway",
                        elementType: "labels",
                        stylers: [
                          { visibility: "off"  }
                        ]
                      },

                      {
                        featureType: "poi.business",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.government",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.attraction",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.medical",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.place_of_worship",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.sports_complex",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.school",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi.park",
                        elementType: "labels.icon",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                       {
                        featureType: "landscape",
                        elementType: "labels.icon",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "administrative",
                        elementType: "labels.icon",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "transit.station",
                        stylers: [
                          {visibility: "off" }
                        ]
                      },
                      {
                        featureType: "poi",
                        elementType: "labels.icon",
                        stylers: [
                          { visibility: "off" }
                        ]
                      },
                      {
                        featureType: "road.local",
                        elementType: "labels",
                        stylers: [
                          { visibility: "on" }
                        ]
                      }
              ]);



        // Put layer data into a JS object
      var layerSource = 'http://ift.tt/1vWhvnO';


        // For storing the sublayers
      var sublayers = [];

    var cdbOptions = {
            cartodb_logo: false,
            mobile_layout: true
          }
      // Add data layer to your map
      cartodb.createLayer(map,layerSource, cdbOptions)
          .addTo(map)
          .done(function(layer) {
             //console.log(layer);   
             var num_sublayers = layer.getSubLayerCount();

             for (var i = 0; i < num_sublayers; i++) {
                sublayers[i] = layer.getSubLayer(i);
                //console.log(sublayers[i]); 
              } 


            var sublayer0Shown = true;
              $("#sublayer0").on('click', function() {
              if (sublayer0Shown) {
                  sublayers[0].hide();
                  sublayers[1].hide();
                  $("#switch1").removeClass('right switch enabled');
                  $("#switch1").addClass('right switch disabled');

                } else {
                  sublayers[0].show();
                  sublayers[1].show();
                  $("#switch1").removeClass('right switch disabled');
                  $("#switch1").addClass('right switch enabled');
                }
                sublayer0Shown = !sublayer0Shown; 
              });

            var sublayer1Shown = true;
              $("#sublayer1").on('click', function() {
              if (sublayer1Shown) {
                  sublayers[2].hide();
                  sublayers[3].hide();
                  $("#switch2").removeClass('right switch enabled');
                  $("#switch2").addClass('right switch disabled');
                } else {
                  sublayers[2].show();
                  sublayers[3].show();
                  $("#switch2").removeClass('right switch disabled');
                  $("#switch2").addClass('right switch enabled');
                }
                sublayer1Shown = !sublayer1Shown; 
              });


          })
          .error(function(err) {
              console.log("error: " + err);
          });



  }

  window.onload = main;

</script>