cPanel is a commercially available and popular Linux for managing all aspects of a web hosting account.
Whenever visitors try to visit a page that’s not available on your website they wil get an error message. You can customize these error messages.
Different types of error pages include

1. ✓ 400 (Bad Request)
2. ✓ 401 (Authorization Required)
3. ✓ 403 (Forbidden)
4. ✓ 404 (Not Found)
5. ✓ 500 (Internal Server Error)

Here are the steps you’ll need to follow for customization

• Log in to your cPanel account.
• In the Advanced section, click on the Error Pages icon.
• Click on the Error Page type you would like to edit.
• Enter HTML syntaxes in the text box.
• Click the Save button.

You’ve successfully created your custom error page.