score:2

Accepted answer

you can set the borderwidth to 0 of the pie chart.

    plotoptions: {
        pie: {
            borderwidth: 0
        }
    }

// build the chart
highcharts.chart('container', {
  chart: {
    plotbackgroundcolor: null,
    plotborderwidth: null,
    plotshadow: false,
    type: 'pie'
  },
  plotoptions: {
    pie: {
      borderwidth: 0
    }
  },
  series: [{
    data: []
  }]
});
<script src="https://code.highcharts.com/highcharts.js"></script>


<div id="container" style="min-width: 310px; height: 400px; max-width: 600px; margin: 0 auto"></div>


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