How to change color of stroke? Kendo Angular Chart

[Tera]

    <kendo-chart [categoryAxis]="{ categories: categories }">
      <kendo-chart-series-defaults type="bar">
        <kendo-chart-series-defaults-labels format="c">
        </kendo-chart-series-defaults-labels>
      </kendo-chart-series-defaults>

      <kendo-chart-series>
        <kendo-chart-series-item [data]="salesData"> </kendo-chart-series-item>
        <kendo-chart-series-item [data]="purchaseData">
        </kendo-chart-series-item>
      </kendo-chart-series>
    </kendo-chart>