def NOT_FOUND_FILE():
    """
    Hardcoded CSS file
    """
    return """
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>404 Page not found</title>
    <link rel="shortcut icon" href="https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/160/google/223/hugging-face_1f917.png">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.8.0/css/bulma.min.css">
    <link href="https://fonts.googleapis.com/css?family=Montserrat:900&display=swap" rel="stylesheet">
    <script defer src="https://use.fontawesome.com/releases/v5.3.1/js/all.js"></script>
  </head>
  <body style="font-family: 'Montserrat', serif; user-select: none;">
    <section class="hero is-fullheight">
    <div class="hero-body">
        <div class="container has-text-centered">
        <h1 class="title is-1">
            Oops!
        </h1>
        <h2 class="subtitle">
            404 PAGE NOT FOUND
        </h2>
        <a href="/" class="button is-dark is-focused is-rounded">
            <span class="icon">
                <i class="fas fa-home"></i>
            </span>
            <span>
                Go back home
            </span>
        </a>
        </div>
    </div>
    </section>
  </body>
</html>
"""
