message: Updated: default bg color to transparent.
diff: @@ -62,7 +62,8 @@ Highcharts.setOptions({
  },
  chart: {
  defaultSeriesType: 'bar',
  - zoomType: 'x'
  + zoomType: 'x',
  + backgroundColor: 'transparent'
  },
  credits: { enabled: false },
  exporting: { enabled: false },
  