How can I stop site scrolling when opening the hamburger menu using CSS?

[testaluca]

Hi,

I have a problem with the hamburger menu.
When I open the menu the site scrolling stays on, creating confusion and clutter on the site. How can I remove the site scrolling when I open the menu using CSS?
Once this is fixed I would also like to add the social icons to the bottom of the menu.
Thank you to anyone who can help me