Stop slider

I know someone asked the same question before, but the offered solution is not working (for me or any more, I’m not sure). This was the solution: (https://www.ads-software.com/support/topic/how-to-slop-slider-effect/)

.wp-post-nav #post-nav-previous-default:hover,
.wp-post-nav #post-nav-previous-switched:hover {
right:-45vw !important;
}
.wp-post-nav #post-nav-next-default:hover,
.wp-post-nav #post-nav-next-switched:hover {
left:-45vw !important;
}

But for me on the left button, I get normal slider, and on right button I get some kind of flickering. Do you think it is a problem with my configuraion or because this solution was for older version?

Tnx.
Vedrna