update the css in ASPACE

application_controller.rb

# plugins/local/frontend/controllers/application_controller.rb
# Obviously, not a application controller, but we just name it this to follow a convention.

class ApplicationController < ActionController::Base
end

module ApplicationHelper

  def include_theme_css
    css = ""
    css += stylesheet_link_tag("themes/#{ArchivesSpace::Application.config.frontend_theme}/bootstrap", :media => "all")
    css += stylesheet_link_tag("themes/#{ArchivesSpace::Application.config.frontend_theme}/application", :media => "all")
    css += stylesheet_link_tag("/assets/custom.css", :media => "all")
    css.html_safe
  end

end

custom.css

/* plugins/local/frontend/assets/custom.css  */
body {
    background: red; 
}