grid force layout

<!DOCTYPE html>
<html>
	<head>
		<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
		<title>Media Plan</title>
				<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script>
		<style type="text/css">

.sections {
float:left;
width:12%; 
    border-style: solid;
    border-color: #ff0000 ;
    border-width: 1px;
    height:100px;

}
		</style>
	</head>
	<body>
	<h1 >Data Insight |  Project Status</h1>
	<p>Keep tabs on what projects the Data team are currently working on and what stage they're at.</p>

var sections = d3.range(40);

var grid = d3.select('body').selectAll("div").data(sections).enter().append("div").attr("class","sections").attr("id",function(d) {return 'section'+d;});

var color = d3.scale.category20();

var force = d3.layout.force()
    .charge(-200)
    .linkDistance(20)
    .size([150,100]);

var a = d3.selectAll('div').append("svg").attr("height","100%").attr("width","100%");

d3.json("raw.json", function(error, graph) {
  force
      .nodes(graph.nodes)
      .links(graph.links)
      .start();

var link = a.selectAll(".link")
      .data(graph.links)
    .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return 2; });

node.append("title")
      .text(function(d) { return d.name; });

force.on("tick", function() {
    link.attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });

node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  });
});

</script>
	</body>
</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js