code: @Nonnull
    public BootstrapBorderBuilder radius (@Nonnull final EBootstrapBorderRadiusType eRadius)
    {
      ValueEnforcer.notNull (eRadius, "Radius");
      m_eRadius = eRadius;
      return this;
    }
docs: Set the border radius. Default is no radius.
  
  @param eRadius
  Border type. May not be <code>null</code>.
  @return this for chaining