6.7 area chart | overlap

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<meta charset="utf-8">
<html>
<head>

<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">

<script src="https://d3js.org/d3.v4.min.js"></script>

<p id="h1">AREA CHART | OVERLAP</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>

<style>

/*Defining text stylings*/

#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family: 'Montserrat Alternates', sans-serif;
  font-weight:300;
}

#link {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
	margin:5px 0px 0px 22px;
  color:white;
}

a:link, a:visited, a:active {
	text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}

body {
  background-color:#011227;
}

/*Defining chart stylings*/

.area {
  opacity:0.8;
}

/*Defining axis stylings*/

.x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:8px;
  opacity:1;
  fill:white;
}

.y-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:9px;
  opacity:1;
  fill:white;
}

.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}

.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}

.y-axis line, .x-axis line {
  fill:none;
  stroke-width:1;
  stroke-opacity:1;
  stroke:white;
  stroke-dasharray:2;
}

</style>
</head>

//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 700 - m.left - m.right,
    h = 700 - m.top - m.bottom;

//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
    .attr("transform", `translate(${m.left}, ${m.top})`);

//Time format
var parseDate = d3.timeParse("%Y/%m/%d %H:%M");

//Data loading
d3.csv(
  "https://gist.githubusercontent.com/sandravizz/8513c1bbd679a7135ea9b6e0e120b8bd/raw/3d18edf831fa71119c650ff77f31c148fc5799f4/kw_zoomed",
  type,
  data => {

//Data format
  var sources = data.columns
  		.slice(1)
  		.map(id => { return {id: id, values: data.map(d=> { return {date: d.date,kW: d[id]};})};});

//X scale
  var x = d3.scaleTime()
      .domain(d3.extent(data, d => d.date))
  		.range([0, w]);

//Y scale
  var y = d3.scaleLinear()
      .domain([0, d3.max(sources, c => d3.max(c.values, d => d.kW))])
  		.range([h, 0]);

//Color scale
  var c = d3.scaleOrdinal()
      .domain(sources.map(c => c.id))
      .range(["#85f6fa", "#8ff798"]);

//Area generator
  var area = d3.area()
      .curve(d3.curveMonotoneX)
      .x(d => x(d.date))
    	.y0(y(0))
    	.y1(d => y(d.kW));

//X axis
  svg.append("g")
     .attr("class", "x-axis")
  	 .attr("transform", `translate(15, ${h})`)
     .call(d3.axisBottom()
             .scale(x)
      		   .ticks(10)
             .tickPadding(10)
             .tickSize(0));

//Y axis
  svg.append("g")
     .attr("class", "y-axis")
     .attr("transform", `translate(0, ${0})`)
     .call(d3.axisLeft()
             .scale(y)
      		   .tickValues([200, 300, 400, 800, 1200])
             .tickSize(-w)
  					 .tickPadding(10));

//Draw the area
  var sourc = svg.selectAll(".area")
      .data(sources)
      .enter()
      .append("g")
      .append("path")
      .attr("d", d => area(d.values))
      .style("fill", d => c(d.id))
      .attr('class', 'area');

});

//Data format
  function type (d, _, columns) {
    d.date = parseDate(d.date);
    for (var i = 1, n = columns.length, c; i < n; ++i) d[c = columns[i]] = +d[c]; return d
  ;}

</script>
</body>
</html>

https://d3js.org/d3.v4.min.js