Fixed size slider

Line chart with fixed size slider. Slider can only be moved from side to side.

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.line {
        fill: none;
        stroke: steelblue;
        stroke-width: 1.5px;
}
    /*.handle {
        pointer-events: none;
    }*/
  
</style>
<head>
</head>
<body>
    <script src="//d3js.org/d3.v4.min.js"></script>

for (i = 0; i < samples; i++) {
            data.push({
                id: i + 1,
                y: d3.format(".3")(random()) 
            });
        }
        return data;
    }

var data = randomData(200);

var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 560 - margin.left - margin.right,
    height = 260 - margin.top - margin.bottom;

var x = d3.scaleLinear()
    .range([0, width]);

var y = d3.scaleLinear()
    .range([height, 0]);

var line = d3.line()
    .x(function(d) { return x(d.id); })
    .y(function (d) { return y(d.y); });

var brush = d3.brushX()
        .extent([[0, 0], [width, height]]);

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 + ")");

data.forEach(function (d) {
      Object.keys(data[0]).forEach(function (k) {
          d[k] = +d[k];
      });
  });

x.domain(d3.extent(data, function(d) { return d.id; }));
  y.domain(d3.extent(data, function (d) { return d.y; }));

var gX = svg.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

var gY = svg.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y));

svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);

var gBrush = svg.append("g")
        .attr("class", "brush")
        .call(brush)
      .call(brush.move, [x(60), x(120)]);

// removes handle to resize the brush
    d3.selectAll('.brush>.handle').remove();
    // removes crosshair cursor
    d3.selectAll('.brush>.overlay').remove();

</script>
</body>

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