RewriteEngine on
RewriteCond %{REQUEST_URI} !^/_wpez21/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /_wpez21/$1
RewriteCond %{HTTP_HOST} ^(www.)?occcustomsite10.com$ [NC]
RewriteRule ^(/)?$ _wpez21/index.php [L]
ErrorDocument 404 /_wpez21/index.php?error=404