code: @NonNull
      public IconicsDrawable backgroundContourWidthPx(@Dimension(unit = PX) int sizePx) {
          mBackgroundContourWidth = sizePx;
          mBackgroundContourBrush.getPaint().setStrokeWidth(sizePx);
          drawBackgroundContour(true);
  
          invalidateSelf();
          return this;
      }
docs: Set background contour width for the icon.
  
  @return The current IconicsDrawable for chaining.