Piechart positioning

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/canvasjs/1.7.0/canvasjs.min.js"></script>
 <div id="charts">
 </div>

CSS

#charts > div {
  width: 100%;
  height: 300px;
  margin-top: 10px;
}

#charts > div:first-child {
  margin-top: 0px;
}

JavaScript

// Credits to http://stackoverflow.com/a/1349426/3867423 for makeRandomLabel()
function makeRandomLabel(length)
{
    var text = [];
    var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for( var i = 0; i < length; i++ )
        text.push(possible.charAt(Math.floor(Math.random() * possible.length)));

    return text.join('');
}
// Credits to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random for getRandomIntInclusive(min, max)
function getRandomIntInclusive(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function makeRandomDataPoint() {
	var labelLength = getRandomIntInclusive(5, 20);
  var value = getRandomIntInclusive(0, 500);
  var label = makeRandomLabel(labelLength);
  
  return {
  	label: label,
    legendText: label,
    y: value
  }
}

function range(length) {
	var range = [];
  
  for (var i = 0; i < length; i++) {
  	range.push(i);
  }
  
  return range;
}

var legend = {
  verticalAlign: "center",
  horizontalAlign: "right",
  fontFamily: "Arial",
  fontSize: 12,
  markerMargin: 5,
  maxWidth: 400  
};
var type = "pie";
var showInLegend = true;
var charts = [
  {
    legend: legend,
    data: [{
      type: type,
      showInLegend: showInLegend,
      dataPoints: range(100).map(makeRandomDataPoint)
    }]
  },
  {
    legend: legend,
    data: [{
      type: type,
      showInLegend: showInLegend,
      dataPoints: range(10).map(makeRandomDataPoint)
    }]
  },
  {
    legend: legend,
    data: [{
      type: type,
      showInLegend: showInLegend,
      dataPoints: range(1).map(makeRandomDataPoint)
    }]
  }
];
var chartRoot = document.getElementById('charts');
console.log(charts);
charts.forEach(function(chartOptions, index) {
	var chartContainer = document.createElement('div');
  chartRoot.appendChild(chartContainer);
	var chart = new CanvasJS.Chart(chartContainer, chartOptions);
	chart.render();
});