Pie Chart

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .arc text {
      fill: white;
      font-weight: bold;
    }
    .arc. path {
      stroke: red;
/*       stroke-width: 2; */
    }
    .title {
      font-size: 1.5rem;
      font-weight: 700;
/*       text-decoration: underline; */
      text-transform: Capitalize;
    }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var width = 960,
        height = 500,
    		margin = 50,
        colors = [
          'rgba(142, 68, 173,1.0)',
          'rgba(41, 128, 185,1.0)',
          'rgba(22, 160, 133,1.0)'
        ],
        classes = ['1st Class', '2nd Class', '3rd Class'];
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
    
    var title =svg.append('g')
    	.append('text')
    	.attr('class', 'title')
    	.text('class distribution among titanic survivors')
    var TITLE_LENGTH = Number.parseInt(title.style('width').substr(0,3))
    
    //center the title over the chart (I know i did this the hardway)
    title.attr('transform', `translate(${(width / 2) - (TITLE_LENGTH / 2)}, ${margin})`)
    
    var chart = svg.append('g')
    	.attr('transform', `translate(${width / 2}, ${height / 1.8})`)
    
    var arc = d3.arc()
    	.innerRadius(1)
    	.outerRadius(200)
    	.padRadius(20)
		var pie = d3.pie()
    	.padAngle(.1);  
    
    d3.csv('Titanic.csv', function(d) {
      var survivors = d.filter(function(el) {
        if(Number.parseInt(el.Survived)) {
          return el
        }
      })
      var NUM_1_CLASS = survivors.filter(function(el) {
        if(el.PClass === '1st') {
          return el
        }
      }).length
      var NUM_2_CLASS = survivors.filter(function(el) {
        if(el.PClass === '2nd') {
          return el
        }
      }).length
      var NUM_3_CLASS = survivors.filter(function(el) {
        if(el.PClass === '3rd') {
          return el
        }
      }).length
      var sections = [
        NUM_1_CLASS,
				NUM_2_CLASS,
				NUM_3_CLASS
      ];
      
      chart = chart.selectAll('.arc')
        .data(pie(sections))
        .enter()
        .append('g')
				.attr('class', 'arc')
      	
      chart.append('path')
      	.attr('d', arc)
      	.attr('fill', function(d, i) { return colors[i]})
      
      chart.append('text')
      	.attr('transform', function(d){ return `translate(${arc.centroid(d)})`})
      	.attr('text-anchor', 'middle')
        .text(function(d, i) {return classes[i]})

})
  </script>
</body>

https://d3js.org/d3.v4.min.js