templates/404.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>mPedigree Invoice Manager | Page Not Found</title>
  <link href="https://fonts.googleapis.com/css?family=Clicker+Script" rel="stylesheet">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css" integrity="sha384-Zug+QiDoJOrZ5t4lssLdxGhVrurbmBWopoEl+M6BdEfwnCJZtKxi1KgxUyJq13dy" crossorigin="anonymous">
</head>
<body>
  <div class="container" style="margin-top: 8rem">
    <div class="row justify-content-center text-center">
      <div class="col-md-10 col-sm-12">
        <h1 class="display-1 logo">mPedigree Invoice Manager</h1>
        <h2 class="display-4">404</h2>
        <h4 class="display-4 mb-4">Page not found ¯\_(ツ)_/¯</h4>
        <p class="lead"><a href="/" class="btn btn-primary btn-lg">Go to the home page →</a></p>

        <br ><br >
        <!-- footer copyright -->
          <div class="footer-copyright">
            <p>Copyright © 2018 mPedigree Invoice Manager. All Rights Reserved. Powered by <a href="https://www.djangoproject.com/" target="_blank">Django</a></p>
          </div>
          <!-- /footer copyright -->

      </div>
    </div>
  </div>
</body>
</html>