src/vs/editor/contrib/zoneWidget/browser/zoneWidget.ts/ZoneWidget/style
class ZoneWidget:	style(styles: IStyles): void {
		if (styles.frameColor) {
			this.options.frameColor = styles.frameColor;
		}
		if (styles.arrowColor) {
			this.options.arrowColor = styles.arrowColor;
		}
		this._applyStyles();
	}