score:2

Accepted answer

I added the "prc" class to the div and created new css rules.

Fiddle demo

CSS

.prc {
  position: relative;
  top: 0px;
  width: 70px;
  height: 35px;
  background-color: #ddd;
  border-radius: 70px 70px 0 0;
}
.prc span {
  position: relative;
  top: 12px;
}

Script

   series: [{
      name: 'customers',
      data: [63.7],
      dataLabels: {
        format: '<div class="prc" style="text-align:center;"><span style="font-size:14px;' +
          'black' + '">{y}%</span>'
      }
    }]

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