Sync Directory Host / Container (volume, mount)

Hello, sry for this question - but I am getting mad…
I have a web-app running and I want to
mirror the webserver folder /var/www of the container to
c:\temp\mirror to change files on c: and see the changes
inside the the browser straight. The folder c:… shall
be consistent after image is stopped/killed. All files
shall be synced. How can I do so?