buttonTheme property
A collection of attributes for the buttons. The object takes SVG
attributes like fill, stroke, stroke-width, as well as style,
a collection of CSS properties for the text.
The object can also be extended with states, so you can set
presentational options for hover, select or disabled button
states.
API Docs: https://api.highcharts.com/highcharts/navigation.breadcrumbs.buttonTheme
Implementation
HighchartsNavigationBreadcrumbsButtonThemeOptions? buttonTheme;