Overlay
The appearance settings for the overlay of the series elements.
gradient?
"glass" | "none" | "roundedBevel" | "sharpBevel"
The gradient of the Chart series.
The supported values are:
"glass"
—Applicable for the Bar, Column, and Candlestick series."none"
"roundedBevel"
—Applicable for the Donut and Pie series."sharpBevel"
—Applicable for the Donut and Pie series.