Its so simple. For customized error pages like 401, 402, 403, 404, 429, 500, 503. follow this setup I will guide you in a very simple way.

1. Enter or just copy past this command "php artisan vendor:publish --tag=laravel-errors".
2. Now just go to public/view/resources/views/error/*.

Now you can see all error pages are available here. just customize it according your needs.