shape-rendering: crispEdges;
fill: url(#area-gradient);
stroke-dasharray: 1px 1px;
<div class="g-chart-container">
<h1> 2016: AAPL Stock Market Close </h1>
src="https://d3js.org/d3.v4.min.js"></script>
var margin = {top: 20, right: 20, bottom: 30, left: 50},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
"translate(" + margin.left + "," + margin.top + ")");
var parseTime = d3.timeParse("%Y-%m-%d");
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
.x(function(d) { return x(d.date); })
.y1(function(d) { return y(d.close); });
d3.csv("aapl.csv", function(error, data) {
data.forEach(function(d) {
d.date = parseTime(d.date);
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([0, d3.max(data, function(d) { return d.close; })]);
var colours = ["#00ffb3","#00fff3","#00cbff","#008cff","#004cff","#000cff"];
svg.append("linearGradient")
.attr("id", "area-gradient")
.attr("gradientUnits", "userSpaceOnUse")
.attr("spreadMethod", "pad")
.style("mix-blend-mode","color-dodge")
.attr("x1", 0).attr("y1", y(0))
.attr("x2", 0).attr("y2", y(110))
.attr("offset", function(d,i) { return i/(colours.length-1); })
.attr("stop-color", function(d) { return d; });
.attr("transform", "translate(0," + height + ")")