gridLineWidth property
The width of the grid lines extending the ticks across the plot area. Defaults to 1 on the Y axis and 0 on the X axis, except for 3d charts.
In styled mode, the stroke width is given in the
.highcharts-grid-line
class.
API Docs: https://api.highcharts.com/highcharts/zAxis.gridLineWidth
Implementation
double? gridLineWidth;