public/404.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>SequenceServer: Not Found</title>
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
</head>
<body class="bg-light text-dark text-center">
<img src="SequenceServer_logo.png" alt="SequenceServer Logo" class="mt-5 mb-3" style="max-width: 200px;">
<div class="container" style="margin-top: 10%;">
<h1 class="display-4">404 Not Found</h1>
<p class="lead">Sorry, the page you are looking for could not be found.</p>
<a href="/" class="btn btn-primary mt-3">Start over</a>
</div>
</body>
</html>