# 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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# plotOptions.gantt.shadow

Whether to apply a drop shadow to the graph line. Since 2.3 the shadow can be an object configuration containing `color`, `offsetX`, `offsetY`, `opacity` and `width`.

Note that in some cases, like stacked columns or other dense layouts, the series may cast shadows on each other. In that case, the `chart.seriesGroupShadow` allows applying a common drop shadow to the whole series group.