How to stop background scroll when dropdown menu active

Hello, I’ve been toiling with this problem for several days now and hope someone is able to help.

In short, I’d like to find a way to prevent background scrolling when the mobile drop down menu is opened on mobile devices, as currently when I open my drop down menu when working with responsive phone mode and even my iPhone, I can continue to scroll in the background which isn’t good for user experience, especially because I have a transparent sticky header above allowing them to see the page move in the background as well. I don’t actually need the mobile menu to be scrollable though, if that is of concern, because all the information always fits in frame. For reference I am using oceanwp with elementor. Thank you for your time.

The page I need help with: [log in to see the link]