admin/views/layouts/error.erb
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
<!--[if lt IE 9]>
<script src="http://html5shim.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<meta name=viewport content='width=device-width,initial-scale=1' />
<title><%= @title.present? ? "#{@title} | Padrino Admin" : "#{pat(:custom_errors.title)} | Padrino Admin" %></title>
<%= favicon_tag "favicon.ico" %>
<link href='http://fonts.googleapis.com/css?family=Varela' rel=stylesheet />
<%= stylesheet_link_tag 'bootstrap', 'application' %>
</head>
<body>
<div class="custom-error text-center">
<div class="custom-error-body muted"><%= yield %></div>
<div class="custom-error-footer">
<%= link_to tag_icon('arrow-left'),"#", :onclick => "history.go(-1);return false;", :class =>"custom-error-go-back btn pull-left", :title => "Go back" %>
</div>
</div>
</body>
</html>