Error page
If your app is not responding, Hatchbox will render a default error page. 

To customize the error page HTML, you can edit the html template found here:

/home/deploy/.hatchbox/templates/error.html

Maintenance Mode page
If your app is in maintenance mode, Hatchbox will render a default page.
 
To customize the maintenance mode page HTML, you can edit the html template found here:

/home/deploy/.hatchbox/templates/maintenance.html