How to animate element on route transition in nuxt?

Question

JavaScript

I look at the documentation: https://ru.nuxtjs.org/guide/routes-transitions/
I need to make sure that when the page loads, there is a preloader and goes down, and when the route changes, raise it up
How to implement this? I tried to animate my element in .page-enter-active, .page-leave-active, but without results
I will be grateful for the help, I've been fiddling all evening