tiny hexbin plot

change size to 100x100 px
decrease hexbin radius
remove hexbin stroke
remove axes

Forked from the block Hexagonal Binning by mbostock, with the original README reproduced below:

This example shows how to use the d3.hexbin plugin for hexagonal binning. 2,000 random points with a normal distribution are binned into hexagons; color encodes the number of points that fall into each bin. You can also use area encoding. Inspired by earlier work by Zachary Forest Johnson.

<!DOCTYPE html>
<meta charset="utf-8">
<title>tiny hexbin plot</title>
<style>

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.hexagon {
  fill: none;
  stroke: #000;
  stroke-width: .5px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="d3.hexbin.min.js"></script>
<script>

var margin = {top: 0, right: 0, bottom: 0, left: 0},
    width = 100 - margin.left - margin.right,
    height = 100 - margin.top - margin.bottom;

var randomX = d3.random.normal(width / 2, 80),
    randomY = d3.random.normal(height / 2, 80),
    points = d3.range(2000).map(function() { return [randomX(), randomY()]; });

var hexbin = d3.hexbin()
    .size([width, height])
    .radius(3);

// the result of the hexbin layout
var hexbinData = hexbin(points);
console.log('hexbinData', hexbinData);

var color = d3.scale.linear()
    .domain([0, d3.max(hexbinData, function(d) {
      return d.length;
    })])
    .range(["white", "steelblue"])
    .interpolate(d3.interpolateLab);

var x = d3.scale.identity()
    .domain([0, width]);

var y = d3.scale.linear()
    .domain([0, height])
    .range([height, 0]);

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

svg.append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("class", "mesh")
    .attr("width", width)
    .attr("height", height);

svg.append("g")
    .attr("clip-path", "url(#clip)")
  .selectAll(".hexagon")
    .data(hexbinData)
  .enter().append("path")
    .attr("class", "hexagon")
    .attr("d", hexbin.hexagon())
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
    .style("fill", function(d) {
      return color(d.length) 
    })
    .style("stroke", "none");

</script>

https://d3js.org/d3.v3.min.js