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HTML 

              
                <div class="chart">
  <h1>Daily visitors</h1>
  <p>The daily amount of unique visitors of <a href="fossheim.io">fossheim.io</a>, measured during the last week (11 May 2020 to 17 May 2020). Days where the visitor count was below your predefined threshold of 100 are highlighted.</p>
</div>

<svg width="0" height="0">
  <defs>
    <pattern id="dots" x="0" y="0" width="3" height="3" patternUnits="userSpaceOnUse">
      <rect fill="#5D92F6" x="0" y="0" width="3" height="3"></rect>
      <circle fill="#11419B" cx="1" cy="1" r="1">
      </circle>
    </pattern>
    
    <pattern id="lines" x="0" y="0" width="3" height="3" patternUnits="userSpaceOnUse">
      <rect fill="#F06B5A" x="0" y="0" width="3" height="3"></rect>
      <rect fill="#B91919" x="0" y="0" width="3" height="1"></rect>
    </pattern>
  </defs>
</svg>
!

CSS 

              
                body {
  background-color: #F6F6FC;
  font-family: sans-serif;
}

h1 {
  margin-left: 1.5rem;
  font-size: 1.25rem;
  color: #110952;
}

p {
  margin-left: 1.5rem;
  padding-right: 1.5rem;
  color: #49456C;
}

.chart {
  width: 700px;
  min-height: 450px;
  margin: 60px auto 0 auto;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 0 10px #D8D8E9;
  padding: 20px;
}

text {
  font-family: sans-serif;
  font-size: 0.65rem;
  fill: #49456C;
}

.bar {
  fill: #5D92F6;
  fill: url(#dots)
}

.bar.danger {
  fill: #F06B5A;
  fill: url(#lines);
}

.yTicks .domain, .yTicks .tick line {
  opacity: 0;
}

.yTicks .tick text {
  opacity: 0.75;
}
!

JS 

              
                const data = [
  {day: "Mon", visitors: 100},
  {day: "Tue", visitors: 174},
  {day: "Wed", visitors: 92},
  {day: "Thu", visitors: 193},
  {day: "Fri", visitors: 103},
  {day: "Sat", visitors: 104},
  {day: "Sun", visitors: 294}];

const margin = {left: 50, right: 50, top: 100, bottom: 50};
const width = 700 - margin.left - margin.right;
const height = 450 - margin.top - margin.bottom;

const chart = d3.select(".chart").append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom);

const x = d3.scaleLinear().rangeRound([0, width]);
const y = d3.scaleLinear().rangeRound([0, height]);

const maxYValue = d3.max(data, row => row.visitors) || 10;

x.domain([0, data.length]);
y.domain([maxYValue + 10, 0]);

const legend = chart.append("g")
  .attr("class", "legend")
  .attr("aria-label", "Legend")
  .attr("x", 0)
  .attr("y", -margin.top);

legend.append("rect")
  .attr("fill", "url(#dots)")
  .attr("width", 13)
  .attr("height", 13)
  .attr("rx", 2)
  .attr("x", margin.left / 2)
  .attr("y", 0);

legend.append("text")
  .text("Over 100 daily visitors")
  .attr("x", margin.left / 2 + 20)
  .attr("y", 10);

legend.append("rect")
  .attr("fill", "url(#lines)")
  .attr("width", 13)
  .attr("height", 13)
  .attr("rx", 2)
  .attr("x", margin.left / 2)
  .attr("y", 30);

legend.append("text")
  .text("Under or equal to 100 daily visitors")
  .attr("x", margin.left / 2 + 20)
  .attr("y", 40);

const xLabel = chart.append("text");

xLabel.append("tspan")
  .text("X Axis")
  .attr("class", "xAxis")
  .attr("text-anchor", "middle")
  .attr("x", -width)
  .attr("y", -height);

xLabel.append("tspan")
  .text("Days of the week (11/05 to 17/05)")
  .attr("class", "xAxis")
  .attr("text-anchor", "middle")
  .attr("x", (width + margin.left + margin.right) / 2)
  .attr("y", height + margin.top + margin.bottom / 1.5);

const xTicks = chart.append("g")
  .attr("aria-label", "Range of the X-axis");

xTicks.selectAll(".xTicks")
  .data(data)
  .enter().append("text")
  .text((data) => data.day)
  .attr("class", "xTicks")
  .attr("x", function(row, index) { return x(index + 1) + 5; })
  .attr("y", height + margin.top)
  .attr("width", 30)
  .attr("text-anchor", "middle");

const yLabel = chart.append("text")
  .attr("transform", "rotate(-90)")
  .attr("class", "yAxis");

yLabel.append("tspan")
  .text("Y Axis")
  .attr("x", -width)
  .attr("y", -height);

yLabel.append("tspan")
  .text("Amount of unique visitors")
  .attr("text-anchor", "middle")
  .attr("x", -height / 2 - margin.top )
  .attr("y", margin.left / 2 + 5);

const yRange = [];

const topYValue = Math.ceil(maxYValue/100)*100;
for(var i = 0; i <= (topYValue / 100); i++) {
  yRange.push(i * 100);
}

const yTicks = chart.append("g")
  .attr("class", "yTicks")
  .attr("aria-label", "Range of the Y-axis");

yTicks.selectAll(".tick")
  .data(yRange)
  .enter()
  .append("text")
    .text(row => row)
    .attr("x", row => row >= 100 ? margin.left - 5 : margin.left + 5)
    .attr("y", row => y(row) + margin.top - 13)
    .attr("opacity", 0.75)
    .attr("width", 30);

yTicks.selectAll(".line")
  .data(yRange)
  .enter()
  .append("line")
    .attr("x1", margin.left + 20)
    .attr("x2", width + margin.left )
    .attr("y1", row => y(row) + margin.top - 15)
    .attr("y2", row => y(row) + margin.top - 15)
    .attr("stroke", "#49456C")
    .attr("stroke-width", 1)
    .attr("opacity", 0.15);

/* const yTicks = chart.append("g")
  .attr("transform", "translate(" + (margin.left + 20) + ", " + (margin.top - 15) + ")")
  .attr("class", "yTicks")
  .call(d3.axisLeft(y).ticks(5)); */

chart.selectAll(".bar")
  .data(data)
  .enter().append("rect")
  .attr("class", row => row.visitors > 100 ? "bar" : "bar danger")
  .attr("x", (row, index) => x(index + 1) )
  .attr("y", row => y(row.visitors) + margin.top - 15)
  .attr("width", 10)
  .attr("height", row => height - y(row.visitors))
  .attr("rx", 5);

const barLabels = chart.selectAll(".label")
  .data(data)
  .enter().append("text").attr("class","label");

barLabels.append("tspan")
  .text(row => row.day)
	.attr("text-anchor", "middle")
	.attr("x", -width)
  .attr("y", -height);

barLabels.append("tspan")
  .text(row => row.visitors)
	.attr("text-anchor", "middle")
	.attr("x", (row, index) => x(index + 1) + 5)
  .attr("y", row => y(row.visitors) + margin.top - 20);
!
999px

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