src/vs/editor/contrib/colorPicker/browser/colorPickerWidget.ts/ColorPickerHeader/onDidChangeColor
class ColorPickerHeader:	private onDidChangeColor(color: Color): void {
		this.pickedColorNode.style.backgroundColor = Color.Format.CSS.format(color) || '';
		this.pickedColorNode.classList.toggle('light', color.rgba.a < 0.5 ? this.backgroundColor.isLighter() : color.isLighter());
		this.onDidChangePresentation();
	}