How can I make the rails console prompt standout in production?

application.rb

# config/application.rb
class Application < Rails::Application
  console do
    console_settings = File.join(Rails.root, "lib/console.rb")

    if File.exists?(console_settings)
      puts "Loading lib/console.rb ..."
      ARGV.push "-r", root.join("lib/console.rb")
    end
  end
end

console.rb

# lib/console.rb
require 'irb/completion'

def colorize_env(env)
  colors = {"production" => "31","development" => "32", "staging" => "33"}
  color_code = colors[env]
  return "\033[#{color_code}m#{env}\033[0m"
end

app = Rails.application.class.name.split('::').first
env = Rails.env

prompt = "[%i] [#{app}][#{colorize_env(env)}] %N(%m)"

IRB.conf[:PROMPT] ||= {}
IRB.conf[:PROMPT][:RAILS] = {
  PROMPT_I: "#{prompt}> ",
  PROMPT_N: "#{prompt}> ",
  PROMPT_S: "#{prompt}%l ",
  PROMPT_C: "#{prompt}* ",
  RETURN:   "=> %s\n"
}

IRB.conf[:PROMPT_MODE] = :RAILS