cPanel provides a section to handle the errors in a very easy way, the only thing that you have to do is add the text you want to appear when a certain type of error is generated; in this case error 404.
You can edit all this, by following these steps:
1- Access your panel with your access data.
2- Then go to the "Advanced" section and click on "Error pages".
3- Once inside that section, we click on "404 (Not found)".
4- There, you can enter the error text you want and apply formats.
5- Click on "Save" to pay to save the changes.

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