discourse/app/views/exceptions/not_found.html.erb

<% local_domain = "#{request.protocol}#{request.host_with_port}" %>

<p><%= t 'page_not_found.title' %></p>
<table>
  <tr>
    <td style="vertical-align:top; padding:0 20px 20px 0;">
      <h2><%= t 'page_not_found.popular_topics' %></h2>
      <% @popular.each do |t| %>
        <%= link_to t.title, t.relative_url %><br/>
      <% end %>
      <br/>
      <a href="/popular" class="btn"><%= t 'page_not_found.see_more' %>&hellip;</a>
    </td>
    <td style="vertical-align:top; padding:0 0 20px 0;">
      <h2><%= t 'page_not_found.recent_topics' %></h2>
      <% @recent.each do |t| %>
        <%= link_to t.title, t.relative_url %><br/>
      <% end %>
      <br/>
      <a href="/popular" class="btn"><%= t 'page_not_found.see_more' %>&hellip;</a>
    </td>
  </tr>
</table>
<h2><%= t 'page_not_found.search_title' %></h2>
<p>
  <form action='http://google.com'>
    <input type="text" name='q' value="site:<%= local_domain %> <%= @slug %>">
    <!--<input type="button" class="btn" value="Search Here" onclick="alert('single page search results not implemented yet');" />-->
    <input type="submit" class="btn btn-primary" value="<%= t 'page_not_found.search_google' %>" />
  </form>
</p>