public/500.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Call4Paperz - 500 Internal Server Error</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<link rel="stylesheet" type="text/css" href="/public-assets/stylesheets/error-pages.css">
<link rel="icon" href="/favicon.ico" type="image/ico"/>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<a class="navbar-brand" href="/">
<img src="/public-assets/images/logo.png">
</a>
</div>
</nav>
<section class="container content">
<h1>500 - Internal Server Error</h1>
<p class="lead">
Ouch! Something wrong has happened :(
<br>
Please try again!
<br>
Or, why don't you try to find out about some Events?
</p>
<a href="/events" class="btn btn-lg btn-default">List Events</a>
</section>
<footer>
<div class="container">
<p>Copyright © Call4Paperz</p>
</div>
</footer>
</body>
</html>