Hackerrank score

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

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

.line {
  fill: none;
  stroke: #22B84C;
  stroke-width: 2px;
}

</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>

var margin = {top: 20, right: 40, bottom: 20, left: 25},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var formatValue = d3.format(",.2f");

var x = d3.scale.linear()
    .range([0, width]);

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

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var line = d3.svg.line()
    .x(function(d) { return x(d.order); })
    .y(function(d) { return y(d.score); });

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 + ")");

d3.csv("data.csv", function(error, data) {
  if (error) throw error;

data.forEach(function(d) {
    d.order = +d.order;
    d.score = +d.score;
  });

x.domain(d3.extent(data, function(d) { return d.order; }));
  y.domain([0,60]);

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("x", 0)
      .attr("y", 10)
      .attr("transform", "rotate(-90)")
      .style("text-anchor", "end")
      .style("font-weight","bold")
      .text("Hackerrank Score");

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("x", 0)
      .attr("y", -4)
      .attr("transform", "translate(" + width + ",0)")
      .style("text-anchor", "end")
      .style("font-weight","bold")
      .text("Attempts");

svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);

var dot = svg.selectAll(".dot")
    .data(data)
  .enter().append("g")
    .attr("class","dot");

dot.append("circle")
      .attr("class", "dot")
      .attr("r", 5)
      .attr("cx", function(d) { return x(d.order); })
      .attr("cy", function(d) { return y(d.score); })
      .style("stroke-width","1px")
      .style("stroke","white")
      .style("fill","#22B84C");

dot.append("text")
      .attr("class", "dot")
      .attr("x", function(d) { return x(d.order) + 5; })
      .attr("y", function(d) { return y(d.score) - 5; })
      // .style("font-weight","bold")
      .style("font-size","11px")
      .text(function(d) { return d.score; });

});

</script>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js