public static @Nullable Color iconFillColor(boolean useContrastColors) {
        Color base;
        if (useContrastColors) {
          base = JBColor.namedColor("Tooltip.Learning.iconFillColor", CLEAR);
        }
        else {
          base = JBColor.namedColor("GotItTooltip.iconFillColor", CLEAR);
        }

        if (base.getAlpha() == 0) return null;
        else return base;
      }
public static @Nullable Color iconFillColor(boolean useContrastColors)