nest.css

body {
  font: 11px tahoma, arial, sans-serif;
}

  .axis path,
  .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
  }

  .line {
    fill: none;
    stroke: steelblue;
    stroke-width: 2.0px;
  }

  .brush .extent {
    stroke: #fff;
    fill-opacity: .125;
    shape-rendering: crispEdges;
}