borderWidth property

double? borderWidth
getter/setter pair

The width of the border surrounding each column or bar. Defaults to 1 when there is room for a border, but to 0 when the columns are so dense that a border would cover the next column.

In styled mode, the stroke width can be set with the .highcharts-point rule.

API Docs: https://api.highcharts.com/highcharts/series.waterfall.borderWidth

Implementation

double? borderWidth;