openproject/extra/sample_plugin/app/views/example/say_hello.rhtml

<p class="icon icon-example-works"><%= l(:text_say_hello) %></p>

<p><label>Example setting</label>: <%= @value %></p>

<%= link_to_if_authorized 'Good bye', :action => 'say_goodbye', :id => @project %>

<% content_for :header_tags do %>
  <%= stylesheet_link_tag "example.css", :plugin => "sample_plugin", :media => "screen" %>
<% end %>