Google Charts Timelines chart coloring

Google Charts Timelines chart coloring

<html>
   <head>
      <title>Google Charts Tutorial</title>
      <script type = "text/javascript" src = "https://www.gstatic.com/charts/loader.js"></script>
      <script type = "text/javascript" src = "https://www.google.com/jsapi"></script>
      <script type = "text/javascript">
         google.charts.load('current', {packages: ['timeline']});     
      </script>
   </head>

   <body>
      <div id = "container" style = "width: 550px; height: 400px; margin: 0 auto">
      </div>
      <script language = "JavaScript">
         function drawChart() {
            // Define the chart to be drawn.
            var data = new google.visualization.DataTable();

            data.addColumn({
               type: 'string', id: 'President'
            });

            data.addColumn({
               type: 'date', id: 'Start'
            });

            data.addColumn({
               type: 'date', id: 'End'
            });

            data.addRows([
               [ 'George Washington', new Date(1789, 3, 30), new Date(1797, 2, 4) ],
               [ 'John Adams',      new Date(1797, 2, 4),  new Date(1801, 2, 4) ],
               [ 'Thomas Jefferson',  new Date(1801, 2, 4),  new Date(1809, 2, 4) ]
            ]);

            var options = {      
               width: '100%',
               height: '100%',
               colors: ['#cbb69d', '#603913', '#c69c6e']
            };

            // Instantiate and draw the chart.
            var chart = new google.visualization.Timeline(document.getElementById('container'));
            chart.draw(data, options);
         }
         google.charts.setOnLoadCallback(drawChart);
      </script>
   </body>
</html>