.htaccess

ErrorDocument 403 /403.html
ErrorDocument 500 /500.html
ErrorDocument 503 /503.html

<IfModule mod_rewrite.c>
  RewriteEngine On


  # Some hosts may require you to use the `RewriteBase` directive.
  # Determine the RewriteBase automatically and set it as environment variable.
  # If you are using Apache aliases to do mass virtual hosting or installed the
  # project in a subdirectory, the base path will be prepended to allow proper
  # resolution of the index.php file and to redirect to the correct URI. It will
  # work in environments without path prefix as well, providing a safe, one-size
  # fits all solution. But as you do not need it in this case, you can comment
  # the following 2 lines to eliminate the overhead.
  RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
  RewriteRule ^(.*) - [E=BASE:%1]

  # If the above doesn't work you might need to set the `RewriteBase` directive manually, it should be the
  # absolute physical path to the directory that contains this htaccess file.
  # RewriteBase /

  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteRule ^ index.php [QSA,L]
</IfModule>