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

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# global.buttonTheme

General theme for buttons. This applies to the zoom button, exporting context menu, map navigation, range selector buttons and custom buttons generated using the `SVGRenderer.button` function. However, each of these may be overridden with more specific options.