JSFiddle - React, Tailwind, and code Playground

HTML

<button id="reset">Redraw</button>

CSS

.axis path,
.axis line {
  fill: none;
  stroke: #555555;
  shape-rendering: crispEdges;
}

.bar {
  fill: steelblue;
}
.x.axis path {
  display: none;
}

JavaScript

var effort = [];
var obj = {
  pfte: "50",
  efte: "20",
    qName:"Q1"
};
var obj2 = {
  pfte: "40",
  efte: "60",
    qName:"Q2"
};

effort[0] = obj;
effort[1] = obj2;
var dataSet = new Object();
dataSet.effort = effort;

var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 400 - margin.left - margin.right,
height = 200 - margin.top - margin.bottom;
var x = d3.scale.ordinal().rangeRoundBands([0, width], .2);
var y = d3.scale.linear().rangeRound([height, 0]);
var color = d3.scale.ordinal().range(["green", "blue"]);
var xAxis = d3.svg.axis().scale(x).orient("bottom");
var yAxis = d3.svg.axis().scale(y).orient("left").tickFormat(d3.format(".2s"));
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 + ")");
var effortDataSet;
var state;
color.domain(d3.keys(dataSet.effort[0]).filter(function(key) { 
				return key !== "qName"; }));
			effortDataSet =dataSet.effort;
			effortDataSet.forEach(function(d) {
				var y0 = 0;
				d.effortHr = color.domain().map(function(name) { 
					return {name: name, y0: y0, y1: y0 += +d[name]}; });
				d.total = d.effortHr[d.effortHr.length - 1].y1;
			});
x.domain(effortDataSet.map(function(d) { 
	return d.qName; }));
y.domain([0, d3.max(effortDataSet, function(d) { 
	return d.total; })]);

svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);

svg.append("g")
  .attr("class", "y axis")
  .call(yAxis)
  .append("text")
  .attr("transform", "rotate(-90)")
  .attr("y", 6)
  .attr("dy", ".71em")
  .style("text-anchor", "end")
  .text("FTE");

state = svg.selectAll(".effort")
  .data(effortDataSet)
.enter().append("g")
  .attr("class", "g")
  .attr("transform", function(d) { return "translate(" + x(d.qName) + ",0)"; });

 state = state.selectAll("rect")
  .data(function(d) { 
	  return d.effortHr;...