title: How to increase annotation font size and bold the annotation value in line chart of google api chart?
body: <p>I am using google api line chart with annotation. How can I change the font size and font format?</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
                  google.load("visualization", "1", {packages: ["corechart"]});
                  google.setOnLoadCallback(drawChart);
                  function drawChart() {
                      var data = new google.visualization.DataTable();
                      data.addColumn('string', '');
                      data.addColumn({type: 'string', role: 'annotation'});
                      data.addColumn('number', '');
                      data.addRows([['2010', '67', 67]]);
                      data.addRows([['2011', '69', 69]]);
                      data.addRows([['2012', '68', 68]]);
                      data.addRows([['2013', '67', 67]]);
  
                      var options = {
                          width: 350,
                          height: 250,
                          pointSize: 5,                           
                          legend: {position: 'none'},
                          chartArea: {
                              left: 0,
                              top: 60,
                              width: 300,
                              height: 75},
                          vAxis: {
                              baselineColor: '#fff',
                              gridlines: {color: '#fff'},
                              minValue: 64,
                              maxValue: 71
                          },
                          tooltip: {trigger: 'none'},
                          enableInteractivity: false,
                          annotation: {
                              1: {
                                  style: 'default'
                              }
                          },
                          series: {0: {color: '#4D7AD3'}, 1: {color: '#4D7AD3'}}
                      };
  
                      var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
                      chart.draw(data, options);
                  }
              &lt;/script&gt;
  &lt;body&gt;                
      &lt;h2&gt;Line Charts&lt;/h2&gt;
      &lt;div id="chart_div"&gt;&lt;/div&gt;
  &lt;/body&gt;
  </code></pre>