Web design is all about attending to details -- and that means making sure even your 404 error pages are beautiful and clear, and reflect your brand identity, writes Kendra Gaines. Among the sites with the best error messages are Klapp, which has a fully playable video game on its error page; Audiko, which uses amazing illustrations to keep users engaged; and The Movie Nerd, which uses a variation on the site's logo to ensure consistent branding.

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