Most of the errors displayed by your website can be fully customized. You can submit your own HTML code that will be used as an Error Page for your website.
NOTE
Customizing error pages in Hostinger Website Builder is yet to be supported
You can customize your website's errors by accessing Websites → Manage, searching for Error Pages on the left sidebar, and clicking on it:
There, you can edit each Error Code page separately by clicking Edit and entering your own HTML code. You can also restore to the default error page by clicking Reset:
That's it! Now you know how to set a custom error page for your website 😊