You can display a custom 404 error page when people try to access nonexistent pages on your site.

  1. Navigate to your GitHub Enterprise Pages repository.
  2. Switch to the master branch for a User/Organization Pages site, or to the gh-pages branch for a Project Pages site.
  3. Create a new HTML file named 404.html—or a new Markdown file named 404.md, with permalink: /404.html in its YAML front matter—at the root level of your GitHub Enterprise Pages repository.
  4. Add the content you want to display to lost souls and weary travelers.
  5. Commit your changes and, if you're working on a local clone of your repository, push them up to your GitHub Enterprise instance.