Make Custom 404, 400, and etc. Page

Paste this code, and save as ".htaccess" in your web folder.

example : C:/xampp/htdocs/your_web/.htaccess

# page not available ( 404 not found )
ErrorDocument 404 /path/to/404.php

# bad syntax
ErrorDocument 400 /path/to/400.php

# unautorized
ErrorDocument 401 /path/to/401.php

# not used
ErrorDocument 402 /path/to/402.php

# forbiden
ErrorDocument 403 /path/to/403.php

# internal server error
ErrorDocument 500 /path/to/500.php

# not implemented
ErrorDocument 501 /path/to/501.php

# overload
ErrorDocument 502 /path/to/502.php

# gateway timeout
ErrorDocument 503 /path/to/503.php

and make sure, you have the custom page, must named with the error name, like above.