Allow options to customize the border of the chart such as color and border size in the pivot chart.
For example, to display the chart border color as red, set the properties
color to either “red”
or “#FF0000” or “rgba(255,0,0,1.0)” and
width to 0.5.
Allows to set the color of the border that accepts value in hex and rgba as a valid CSS color string.
Defaults to ”
Allows to set the width of the border in pixels.
Defaults to 1