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.
string
Allows to set the color of the border that accepts value in hex and rgba as a valid CSS color string.
Defaults to ”
number
Allows to set the width of the border in pixels.
Defaults to 1