require 'docx'
require 'nokogiri'

def insert_colored_text_after(bookmark, text, hex_color)
    color = Nokogiri::XML::Node.new("w:color", bookmark.node)
    color['w:val'] = hex_color

    text_run = bookmark.get_run_after
    text_run.text = "#{text}#{text_run.text}"

    text_run.node.children.each do |child|
        #Find the node for formatting
        if child.name == "rPr"
            child<<color
        end
    end
end