Series.extremes.border
configurationThe border of the extremes.
series.extremes.border
Object|Functionseries.extremes.border.color
String|FunctionThe color of the border. Accepts a valid CSS color string, including hex and rgb.
Default: "black"
series.extremes.border.width
Number|FunctionThe width of the border in pixels. By default the border width is set to zero which means that the border will not appear.
Default: 0