The customError module is a simple way to deal with error pages in Drupal 7. It allows for some minimal customizations and does not use up nodes. To use the custom Error module, you will first need to install the module.

Go to Configuration > Site information.

At the bottom of the screen:

Enter "customerror/403" for the 403 option
Enter "customerror/404" for the 404 option
Save configuration when you are done

Go to Configuration > Custom Error.
Customize each of the error pages to your liking.You can also use the HTML format to add your description.
Save configuration when you are done.

Finally, test your new 404 and 403 error pages.

Additional options

The CustomError module has two additional options:

Theme selection: allows you to select a different theme for the error pages.

404 Redirects: The 404 Redirect area allows you to specify 404 URLs that you'd like to redirect. To do so, enter the complete path of the page, add a space, then enter the absolute URL of the destination page.

You can add additional redirects on separate lines.

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