JSFiddle - React, Tailwind, and code Playground

HTML

<div class="legend">
    <ul>
        <li>Time Left</li>
        <li>Clicks per second</li>
    </ul>
 </div>

CSS

body {
    background: #f4f4f4;
    background: url('http://i.imgur.com/yE7vcOO.jpg');
    background-size: cover;
}
.legend ul {
    margin: 5px 15px;
    width: 300px;
    background: white;
    box-shadow: 0 0 5px rgba(0,0,0,.3);
}
.legend li {
    font: 12px sans-serif;
    padding: 7px 30px;
    position: relative;
}
.legend li:nth-child(1):before {
    content: '';
    width: 15px;
    height: 8px;
    border-radius: 50%;
    position: absolute;
    left: 9px;
    top: 8px;
    display: block;
    background: rgba(0,0,200,.7);
}
.legend li:nth-child(2):before {
    content: '';
    width: 15px;
    height: 8px;
    border-radius: 50%;
    position: absolute;
    left: 9px;
    top: 8px;
    display: block;
    background: rgba(0,100,0,.3);
}
svg {
  font: 10px sans-serif;
    background: white;
    box-shadow: 0 0 5px rgba(0,0,0,.3);
    margin-left: 15px;
}

.arc {
  fill: rgba(0,0,200,0.7);
  stroke: #000;
  stroke-width: 0px;
}
.arc2 {
  fill: rgba(0,100,0,0.3);
  stroke: #000;
  stroke-width: 0px;
}

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

.grid .tick line {
  stroke: lightgrey;
  opacity: 0.7;
}
.grid path {
  stroke-width: 0;
}

.legend rect {
  fill:white;
  stroke:black;
  opacity:0.8;
}
/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed,  figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for...

JavaScript

var n = 5, // Number of Minutes to track.
    data = [0],
    data2 = [0];

var margin = {top: 40, right: 20, bottom: 60, left: 60},
    width = 768 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

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

var y = d3.scale.linear()
    .domain([0, 60])
    .range([height, 0]);

var line = d3.svg.line()
    .x(function(d, i) { return x(( (i) / 60) - (1/60)); })
    .y(function(d, i) { return y(d); });

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("defs").append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("width", width)
    .attr("height", height);

var xAxis = svg.append("g")
    .attr("class", "grid x axis")
    .attr("transform", "translate(0," + y(0) + ")")
.call(d3.svg.axis().scale(x).ticks(10).orient("bottom").tickSize(-height, 0, 0));

var yAxis = svg.append("g")
    .attr("class", "grid y axis")
    .call(d3.svg.axis().scale(y).ticks(10).orient("left").tickSize(-width, 0, 0));

var path = svg.append("g")
    .attr("clip-path", "url(#clip)")
  .append("path")
    .datum(data)
    .attr("class", "arc")
    .attr("d", line);

var path2 = svg.append("g")
    .attr("clip-path", "url(#clip)")
  .append("path")
    .datum(data2)
    .attr("class", "arc2")
    .attr("d", line);

svg.append("text")
    .attr("class", "x label")
    .attr("text-anchor", "end")
    .attr("x", width)
    .attr("y", height + 40)
    .text("Minutes");

svg.append("text")
    .attr("class", "y label")
    .attr("text-anchor", "end")
    .attr("y", -40)
    .attr("dy", ".75em")
    .attr("transform", "rotate(-90)")
    .text("BOPS / Seconds left on Timer");

var connection = new...