Maitaining scroll position when mobile keyboard is open

[msmoter]

Hello,
I have an app that uses window virtualizer to display items. When user clicks on selected item - modal with input field is opened. On desktop version everything works fine.
Problem is when app is opened in mobile browser - when keyboard appears, scroll position of items list changes.
Is there any simple way to maitain scroll position? Modal is displaying with position: fixed property.