A 404 error on the web is what a web server responds with when it is tasked with serving up a resource that it can’t find.

  • It should still look like your website
  • Apologize
  • Search
  • Give readers useful links
  • Way to Contact / Report Error
  • Automatic Reporting
  • Humor
  • Redirect?
  • File Size

CSS-Tricks404 Best Practices