You can have a single error page for your website rather than individual error pages for each error (403, 404, 500, etc.).
When you create the desired universal error page with a text/HTML editor of your choice, you have to upload it into a subdirectory of your public_html called errors. Make sure to name the universal error page error.php.
Then you have to open your main .htaccess file and add the following lines in it:
# provide a universal error document
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^.*$ /errors/error.php [L]
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