1<!DOCTYPE html> 2 <html> 3 <head> 4 <meta name="viewport" content="width=device-width, initial-scale=1"> 5 <style type="text/css"> 6 html, body, iframe { margin: 0; padding: 0; height: 100%; } 7 iframe { display: block; width: 100%; border: none; } 8 </style> 9 <title>Application Error</title> 10 </head> 11 <body> 12 <iframe src="//s3.amazonaws.com/heroku_pages/error.html"> 13 <p>Application Error</p> 14 </iframe> 15 </body> 16 </html>