D3 Examples - Responsive Bar chart

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<!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; }
    #chart{
      width: 100%;
      max-width: 800px;
      background-color: #7f00ff;
      margin: 0 auto;
    }
    .bar{
      display: inline-block;
      background-color: #4b0082;
      width: 25px;
      margin-right: 5px;
    }
  </style>
</head>
​
<body>
  <div id="chart"></div>
  <script>
    
    var svg = d3.select("#chart").append("svg")
//       .attr("width", 960)
//       .attr("height", 500)
        .attr('viewBox', '0 0 800 400')
        .attr('preserveAspectRatio', 'xMidYMid');
​
    
​
  </script>
</body>
​
    