How to add drop shadow to d3.js pie or donut chart?

@giovanny.lueilwitz 

To add a drop shadow to a D3.js pie or donut chart, you can use CSS styling to apply box-shadow to the chart element. Here's how you can do it:

1. First, create the pie or donut chart using D3.js as you normally would. For example, you might have code like this:

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var width = 500;
var height = 500;
var radius = Math.min(width, height) / 2;

var svg = d3.select("#chart")
  .append("svg")
  .attr("width", width)
  .attr("height", height)
  .append("g")
  .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");

// ... code to create pie or donut chart

1. Next, add CSS styling to the chart element to apply the drop shadow. You can do this by appending a style tag to the head of your HTML document, or by adding a class to your chart element and defining the styles in your CSS file. For example:

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#chart {
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

1. Save your changes and view the page in your web browser. You should now see a drop shadow applied to your pie or donut chart.

Adjust the box-shadow property values to customize the appearance of the drop shadow. The first two values (0 0) control the horizontal and vertical offset of the shadow from the chart. The third value (10px) controls the blur radius of the shadow. The final value (rgba(0, 0, 0, 0.5)) sets the color of the shadow, with the last value (0.5) controlling the opacity.