Why does a stroke appear when a div is clicked on Android?

Question

css

I have a div that should animate when clicked. On PC, everything is fine, but on Android there is such a stroke:

How to remove it?
outline: none; does not work.

Answer 1

stackoverflow.com/questions/20853238/webkit-tap-hi...

Answer 2

It looks like selection by tapu.

Answer 3

try user-select: none;not to forget the prefixes.