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CSS

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HTML 

              
                <div class="big-chart-container">
  <div id="big-chart"></div>
</div>
!

CSS 

              
                .line {
  fill: none;
  stroke: #36B8BE;
  stroke-width: 1px;
  z-index: 2;
}

.area {
  fill: url(#area-gradient);
  stroke-width: 0;
  z-index: 1;
}

g text {
  font: 1.5rem 'avenir next', 'open sans', sans-serif;
  font-size: 24px;
}

g.tick line {
  stroke: #ccc;
}

g .tick text {
  fill: #444;
}

path.domain {
  stroke: #CCC;
}

.grid line {
  stroke: #aeb0b5;
  stroke-opacity: 0.7;
  stroke-width: .2vh;
  shape-rendering: crispEdges;
  z-index: -1;
}

.grid path {
  stroke-width: 0;
}

.data-point-label {
  font-weight: 600;
  font-size: 16px;
}

.y-axis-labels {
  fill: #CCC;
}
!

JS 

              
                // set the dimensions and margins of the graph
var margin = {
  top: 20,
  right: 60,
  bottom: 90,
  left: 90
},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// parse the date / time
var parseTime = d3.timeParse("%A %B %d %Y %H");
var formatTime = d3.timeFormat("%a"); // %d

// set the ranges
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);

// define the line
var valueline = d3.line()
.x(function (d) {
  return x(d.date);
})
.y(function (d) {
  return y(d.progress);
});

// define the area
var area = d3.area()
.x(d => x(d.date))
.y0(y(0))
.y1(d => y(d.progress));

var div = d3.select("#big-chart-container").append("div")
.attr("class", "tooltip")
.style("opacity", 0);

format = d3.format(".0f")

// append the svg to the chart container
var bigChartSvg = d3.select("#big-chart").append("svg")
.attr("viewBox", "0 0 " + (width + margin.left + margin.right) + " " + (height + margin.top +
                                                                        margin.bottom))
.attr("preserveAspectRatio", "xMaxYMax meet")
.classed("svg-content", true)
.append("g")
.attr("transform",
      "translate(" + margin.left + "," + margin.top + ")");
// Get the data
var data = [
  {
    "date": "Monday March 12 2018 00",
    "progress": 8
  },
  {
    "date": "Monday March 12 2018 06",
    "progress": 11
  },
  {
    "date": "Monday March 12 2018 12",
    "progress": 9
  },
  {
    "date": "Monday March 12 2018 18",
    "progress": 11
  },
  {
    "date": "Tuesday March 13 2018 00",
    "progress": 19
  },
  {
    "date": "Tuesday March 13 2018 06",
    "progress": 21
  },
  {
    "date": "Tuesday March 13 2018 12",
    "progress": 19
  },
  {
    "date": "Tuesday March 13 2018 18",
    "progress": 21
  },
  {
    "date": "Wednesday March 14 2018 00",
    "progress": 23
  },
  {
    "date": "Wednesday March 14 2018 06",
    "progress": 28
  },
  {
    "date": "Wednesday March 14 2018 12",
    "progress": 24
  },
  {
    "date": "Wednesday March 14 2018 18",
    "progress": 34
  },
  {
    "date": "Thursday March 15 2018 00",
    "progress": 38
  },
  {
    "date": "Thursday March 15 2018 06",
    "progress": 38
  },
  {
    "date": "Thursday March 15 2018 12",
    "progress": 40
  },
  {
    "date": "Thursday March 15 2018 18",
    "progress": 40
  },
  {
    "date": "Friday March 16 2018 00",
    "progress": 40
  },
  {
    "date": "Friday March 16 2018 06",
    "progress": 48
  },
  {
    "date": "Friday March 16 2018 12",
    "progress": 52
  },
  {
    "date": "Friday March 16 2018 18",
    "progress": 62
  },
  {
    "date": "Saturday March 17 2018 00",
    "progress": 62
  },
  {
    "date": "Saturday March 17 2018 06",
    "progress": 59
  },
  {
    "date": "Saturday March 17 2018 12",
    "progress": 66
  },
  {
    "date": "Saturday March 17 2018 18",
    "progress": 78
  },
  {
    "date": "Sunday March 18 2018 00",
    "progress": 83
  },
  {
    "date": "Sunday March 18 2018 06",
    "progress": 84
  },
  {
    "date": "Sunday March 18 2018 12",
    "progress": 83
  },
  {
    "date": "Sunday March 18 2018 18",
    "progress": 83
  }
];

// format the data
data.forEach(function (d) {
  d.date = parseTime(d.date);
  d.progress = +d.progress;
});

// scale the range of the data
x.domain(d3.extent(data, function(d) { return (d.date); }));
y.domain([0, 100]);
//attach gradient to area
bigChartSvg.append("linearGradient")
  .attr("id", "area-gradient")
  .attr("gradientUnits", "userSpaceOnUse")
  .attr("x1", 0).attr("y1", y(0))
  .attr("x2", 0).attr("y2", y(100))
  .selectAll("stop")
  .data([{
    offset: "0%",
    color: "#3997A7",
    opacity: ".1"
  },
         {
           offset: "15%",
           color: "#3997A7",
           opacity: ".3"
         },
         {
           offset: "30%",
           color: "#3997A7",
           opacity: ".5"
         },
         {
           offset: "45%",
           color: "#3997A7",
           opacity: ".6"
         },
         {
           offset: "65%",
           color: "#36B8BE",
           opacity: ".7"
         },
         {
           offset: "80%",
           color: "#36B8BE",
           opacity: "1"
         }
        ])
  .enter().append("stop")
  .attr("offset", function (d) {
  return d.offset;
})
  .attr("stop-color", function (d) {
  return d.color;
})
  .attr("stop-opacity", function(d) {
  return d.opacity;
});

// Add the filled area
bigChartSvg.append("path")
  .datum(data)
  .attr("class", "area")
  .attr("d", area)
  .style("opacity", .5);

console.log([data]);
// add the valueline path.
bigChartSvg.append("path")
  .attr("class", "line")
  .attr("d", valueline(data));

// add the x axis
bigChartSvg.append("g")
  .attr("transform", "translate(0," + height + ")")
  .call(d3.axisBottom(x).tickFormat(d3.timeFormat("%a")).ticks(7))
  .selectAll("text")
  .attr("y", 0)
  .attr("x", 8)
  .attr("dy", "40")
  .attr("dx", "3.5%")
  .attr("transform", "rotate(0)") //60
  .style("text-anchor", "start");

// add the y axis
bigChartSvg.append("g")
  .call(d3.axisLeft(y).ticks(5));

// add y axis labels
bigChartSvg.append("text")
  .attr("transform", "rotate(-90)")
  .attr("y", 0 - margin.left)
  .attr("x",0 - (height / 2))
  .attr("dy", "1em")
  .style("text-anchor", "middle")
  .text("% Shift Goal");

bigChartSvg.append("g")
      .attr("fill", "#003A52")
      .attr("text-anchor", "end")
      .style("font", "4px avenir-next")
      .selectAll("text")
      .data(data)
      .enter().append("text")
      .classed("data-point-label",true)
      .attr("x", d => x(d.date))
      .attr("y", d => y(d.progress) - 12)
      .attr("dx", "0.35em")
      .attr("dy", "0.25em")
      .text(d => format(d.progress));
!
999px

Console