app/views/default/not_found.html.erb
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>404 Not Found</title>
<style>
body { background-color: #fff; color: #333; }
body, p, ol, ul, td {
font-family: "Helvetica Neue", helvetica, verdana, arial, sans-serif;
font-size: .9em;
line-height: 18px;
}
pre {
background-color: #eee;
padding: 10px;
font-size: 11px;
white-space: pre-wrap;
}
a { color: #000; }
a:visited { color: #666; }
a:hover { color: #fff; background-color:#000; }
</style>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /<%= @path %> was not found on this server.</p>
</body></html>