.scroll-down-link

try f.e.:

#top .scroll-down-link {
  height: 50px;
  width: 50px;
  bottom: 50px;
  background-color: rgba(255,255,255,0.3);
  border: 1px solid var(--enfold-socket-color-border);
  backdrop-filter: blur(4px);
  border-radius: 10px;
  /*** animation: none; ***/
}
#top .scroll-down-link.avia-svg-icon svg:first-child {
  height: 50px;
}

#top .scroll-down-link:hover {
  background-color: rgba(255,255,255,0.8);
}

#top .scroll-down-link svg path {
  fill: var(--enfold-main-color-primary);
}

if you do not like the animation – just get rid of the outcommenting /*** ***/