# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# navigation.buttonOptions.theme

A configuration object for the button theme. The object accepts SVG properties like `stroke-width`, `stroke` and `fill`. Tri-state button styles are supported by the `states.hover` and `states.select` objects.