Setting parameters for custom HTML 
  
  For simple branded HTML pages, you can adjust the look and feel of the default output to match your company
    style by setting parameters to include custom CSS, header branding, or table-of-contents navigation in topics.
    (These changes do not require a custom plug-in.)
  
Adding navigation to topics <nav> element of each page. The navigation can be rendered in a sidebar or menu via     CSS.Adding custom CSS Adding custom headers and footers Handling content outside the map directory generate.copy.outer  parameter can be used to adjust how output is generated for content     that is located outside the map directory.