The most common website errors such as 404 Page Missing,
401 Access Denied, etc can be customized to your liking. To
customize them, log in to Cpanel. Then click on the Custom
Error Pages button listed under "Site Management Tools". From
there, select the code number of the error you wish to
customize. The next page is the editing page, In the text box,
you can edit the HTML code for the error page.