code: public BaseTableLayout<C, T> pad(float pad) {
          padTop = new FixedValue<C, T>(toolkit, pad);
          padLeft = new FixedValue<C, T>(toolkit, pad);
          padBottom = new FixedValue<C, T>(toolkit, pad);
          padRight = new FixedValue<C, T>(toolkit, pad);
          sizeInvalid = true;
          return this;
      }
docs: Sets the padTop, padLeft, padBottom, and padRight around the table to the
  specified value.