<!DOCTYPE html>
<html>
<head><title>Server error</title></head>
%= stylesheet begin
body { background-color: #caecf6 }
#raptor {
background: url(<%= url_for '/mojo/failraptor.png' %>);
height: 488px;
left: 50%;
margin-left: -371px;
margin-top: -244px;
position:absolute;
top: 50%;
width: 743px;
}
% end
<body><div id="raptor"></div></body>
</html>