style property
CSS styles for the title. If the title text is longer than the
axis length, it will wrap to multiple lines by default. This can
be customized by setting the lineClamp property, by setting a
specific width or by setting whiteSpace: 'nowrap'.
In styled mode, the stroke width is given in the
.highcharts-axis-title class.
API Docs: https://api.highcharts.com/highcharts/navigator.yAxis.title.style
Implementation
HighchartsXAxisTitleStyleOptions? style;