```ruby
# frozen_string_literal: true

module CertModule
  class CompletionPdf < Prawn::Document
    def initialize(options)
      set_fallback_fonts
      options[:background] ||= Rails.root.join 'templates', 'ctf-certificate-template.jpg'
      options[:margin] ||= 0
      super(options)
    end

    def set_fallback_fonts
      font_families.update(
        'Helvetica-Bold'    => { normal: Rails.root.join('lib', 'assets', 'fonts', 'Helvetica-Bold.ttf') },
        'TwitterColorEmoji' => { normal: Rails.root.join('lib', 'assets', 'fonts', 'TwitterColorEmoji.ttf') },
        'SourceHanSans'     => { normal: Rails.root.join('lib', 'assets', 'fonts', 'SourceHanSans.ttf') }
      )
    end

    def fallback_fonts
      %w[TwitterColorEmoji SourceHanSans]
    end

    # def self.generate(options = {}, &block)
    #
    #   super(template, options, &block)
    # end
  end
end
```

Remove commented out code from cert module.
user
```ruby
# frozen_string_literal: true

module CertModule
  class CompletionPdf < Prawn::Document
    def initialize(options)
      set_fallback_fonts
      options[:background] ||= Rails.root.join 'templates', 'ctf-certificate-template.jpg'
      options[:margin] ||= 0
      super(options)
    end

    def set_fallback_fonts
      font_families.update(
        'Helvetica-Bold'    => { normal: Rails.root.join('lib', 'assets', 'fonts', 'Helvetica-Bold.ttf') },
        'TwitterColorEmoji' => { normal: Rails.root.join('lib', 'assets', 'fonts', 'TwitterColorEmoji.ttf') },
        'SourceHanSans'     => { normal: Rails.root.join('lib', 'assets', 'fonts', 'SourceHanSans.ttf') }
      )
    end

    def fallback_fonts
      %w[TwitterColorEmoji SourceHanSans]
    end
  end
end
```
assistant