title: How to change Default color in google charts geomap?
body: <p>I want to change the default yellow color of chart region to user defined color. I can able to change only marker color. I used this code to generate chart data.</p>
  
  <pre><code>         dataTable = new google.visualization.DataTable();
           dataTable.addRows(4);
           dataTable.addColumn('number', 'LATITUDE', 'Latitude');
           dataTable.addColumn('number', 'LONGITUDE', 'Longitude');
           dataTable.addColumn('number', 'Ticket', 'Value'); 
           dataTable.addColumn('string', 'HOVER', 'HoverText');
  
           dataTable.setValue(0,0,12.9715987);
           dataTable.setValue(0,1,77.5945627);
           dataTable.setValue(0,2,43);
           dataTable.setValue(0,3,"Banglore");
  
           dataTable.setValue(1,0,22.642664);
           dataTable.setValue(1,1,88.439122);
           dataTable.setValue(1,2,66);
           dataTable.setValue(1,3,"Kolkatta");
  
           dataTable.setValue(2,0,13.0826802);
           dataTable.setValue(2,1,80.2707184);
           dataTable.setValue(2,2,54);
           dataTable.setValue(2,3,"Chennai");
  
           dataTable.setValue(3,0,9.9252007);
           dataTable.setValue(3,1,78.1197754);
           dataTable.setValue(3,2,64);
           dataTable.setValue(3,3,"Madurai");
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/Izpht.gif" alt="enter image description here"></p>
  
  <p>How to change the region, background and tooltip color? please help me</p>