API Reference > imodeljs-common > Symbology > ThematicGradientSettingsProps > marginColor marginColor marginColor: undefined | number The margin color used at the extremes of the gradient, when outside the applied range. Defaults to a black color using ColorDef.fromJSON with no arguments. Defined in core/common/src/ThematicDisplay.ts Line 59 Last Updated: 11 June, 2024