Stop mouse scroll on google maps

Hello everybody.

I use the Phanes theme on tac.com.gr and i want to put a google map instead of the map that comes with the theme.

I added a google map (embed from google maps) and it work’s fine.

The only problem that i have is that i want to stop the zoom on scroll when the mouse comes over the map. How can i do this?

And where i must make the changes (style.css)?

Thanks very much in advance.