How to set overflow scroll in ios modal?

Question

css

The problem is that the iphone does not properly scroll the modal window with overflow = scroll = what is under it scrolls, not itself. And somehow interacting with the window, it still starts to work somehow strangely until an indefinite moment (not for long).
I made a small example so you understand what I'm talking about: codepen.io/anon/pen/JGoemJ
And I even found a solution here -
stackoverflow.com/questions/3845445/how-to-get-the...
but how is it correct to apply -webkit-overflow-scrolling: touch ?
If it's not difficult, modify my example so that everything works (the same is true on all devices).
And also please write a few words about how then to apply this to the UIkit modal window getuikit.com/docs/modal.html, if you don’t write, thanks anyway, I’ll deal with this part myself then)

Answer 1

https://bugs.webkit.org/show_bug.cgi?id=158342