discourse/app/views/published_pages/show.html.erb

<div class="published-page-wrapper">
  <div class="published-page-header">
    <h1 class="published-page-title"><%= @topic.title %></h1>

    <div class="published-page-author">
      <img width="45" height="45" src="<%= @topic.user.avatar_template.gsub('{size}', '90') %>" class="avatar">
      <div class="published-page-author-details">
        <div class="username"><%= @topic.user.username %></div>
        <div class="topic-created-at"><%= short_date(@topic.created_at) %></div>
      </div>
    </div>

    <%- if @topic.first_post.present? %>
      <div class="published-page-body">
        <%= @topic.first_post.cooked.html_safe %>
      </div>
    <%- end -%>
  </div>
</div>