src/vs/editor/contrib/colorPicker/colorPickerWidget.ts/OpacityStrip/onDidChangeColor
class OpacityStrip:	private onDidChangeColor(color: Color): void {
		const { r, g, b } = color.rgba;
		const opaque = new Color(new RGBA(r, g, b, 1));
		const transparent = new Color(new RGBA(r, g, b, 0));

		this.overlay.style.background = `linear-gradient(to bottom, ${opaque} 0%, ${transparent} 100%)`;
	}