class Kramdown::Converter::Pdf

def header_options(el, opts)
  size = opts[:size] * 1.15**(6 - el.options[:level])
  {
    :font => "Helvetica", :styles => (opts[:styles] || []) + [:bold],
    :size => size, :bottom_padding => opts[:size], :top_padding => opts[:size]
  }
end