# 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.

# chart.seriesGroupShadow

Whether to apply a drop shadow to the global series group. This causes all the series to have the same shadow. Contrary to the `series.shadow` option, this prevents items from casting shadows on each other, like for others series in a stack. The shadow can be an object configuration containing `color`, `offsetX`, `offsetY`, `opacity` and `width`.