desktop client css

[txhammer68]

Trying to get smooth scroll effect like in FireFox with the jellyfin desktop client on Linux X11
I have tried several css injections but none are working ?
Can this even be done w/ css?
here is what i have tried :

.element-smooth {
    scroll-behavior: smooth;
}

*, html {
    scroll-behavior: smooth !important;
}

also scrollbar width, autohide scrollbar until scrolling begins...

thanks