D3 Examples - blue bar chart

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
 
.bar {
  fill: #0067AC;
}
​
.bar:hover {
  fill: #666666;
}
​
.axis--y path {
  stroke: #0067AC;
}
.axis--y line{
  stroke: #0067AC;
}
.axis--y text {
  stroke: #0067AC;
  font: 18px sans-serif;
}
  
.axis--x path {
  display: none;
}
.axis--x line {
    display: none;
}
.axis--x text{
  display: none;
}
</style>
<svg width="1000" height="400"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    margin = {top: 60, right: 60, bottom: 20, left: 100},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;
​
svg.append("rect")
    .attr("x", 0)
    .attr("y", 0)
    .attr("width", 2000)
    .attr("height", 2000)
    .style('fill', '#f8f8f8');
  
var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
    y = d3.scaleLinear().rangeRound([height, 0]);
​
var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.tsv("data.tsv", function(d) {
  d.frequency = +d.frequency;
  return d;
}, function(error, data) {
  if (error) throw error;
​
  x.domain(data.map(function(d) { return d.letter; }));
  y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
  
  g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
​
  g.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y).ticks(10))
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", "0.71em")
      .attr("text-anchor", "end");
​
  g.selectAll(".bar")
    .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.letter); })
      .attr("y", function(d) { return y(d.frequency); })
      .attr("width", x.bandwidth())
      .attr("height", function(d) { return height - y(d.frequency); });
​
  g.append("text")
    .attr("x", (width / 2))
    .attr("y", -20)
    .attr("text-anchor", "middle")  
    .style("font-size", "40px")
    .style("font-family", "sans-serif")
    .style("stroke", "#0067AC")
    .style("fill", "#0067AC")
    .text("Impression Count by Day");
});
​
</script>
    