d3.v3 pan/zoom

<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
    <style type="text/css">
      body, html {
        width: 100%;
        height: 100%;
        margin: 0;
      }
      /* svg {
        position: absolute;
        top: 100;
        left: 100;
      } */
      p {
        text-align: center;
      }
    </style>
  </head>
  <body>
    <p>Use the mouse to pan (click and move) / zoom (scrollwheel)</p>
    
    <script type="text/javascript">
      var svg = d3.select("body")
        .append("svg")
        .attr("width", "100%")
        .attr("height", "100%")
        .call(d3.behavior.zoom().on("zoom", function () {
          svg.attr("transform", "translate(" + d3.event.translate + ")" + " scale(" + d3.event.scale + ")")
        }))
        .append("g")
  
      svg.append("circle")
        .attr("cx", document.body.clientWidth / 2)
        .attr("cy", document.body.clientHeight / 2)
        .attr("r", 50)
        .style("fill", "#B8DEE6")
    </script>
  </body>
  
</html>

// Code goes here

/* Styles go here */