D3 box shadow

 /* For the drop shadow filter... */
  var defs = svg.append("defs");

  var filter = defs.append("filter")
      .attr("id", "dropshadow")

  filter.append("feGaussianBlur")
      .attr("in", "SourceAlpha")
      .attr("stdDeviation", 4)
      .attr("result", "blur");
  filter.append("feOffset")
      .attr("in", "blur")
      .attr("dx", 2)
      .attr("dy", 2)
      .attr("result", "offsetBlur");

  var feMerge = filter.append("feMerge");

  feMerge.append("feMergeNode")
      .attr("in", "offsetBlur")
  feMerge.append("feMergeNode")
      .attr("in", "SourceGraphic");

Source: stackoverflow.com

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