white border of echarts pie chart

• Implement the white edge of echarts
  

  itemStyle: {
    
    
          normal: {
    
    
            borderRadius: 2,
            borderColor: 'rgba(255, 255, 255, 1 )',
            borderWidth: 1,
            color: function(params) {
    
    
              return colorList[params.dataIndex]
            }
          }
        },

• The demo address of echarts https://www.makeapie.com/editor.html?c=xVuZgtOXUA