.scroll-to-top{
  position:fixed;
  right:24px;
  bottom:24px;
  z-index:1100;
  display:grid;
  place-items:center;
  width:48px;
  height:48px;
  padding:0;
  border:2px solid rgba(255,255,255,.9);
  border-radius:50%;
  background:#ff681c;
  color:#fff;
  box-shadow:0 10px 28px rgba(4,20,70,.28);
  font-size:25px;
  font-weight:900;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(14px);
  transition:opacity .22s,visibility .22s,transform .22s,background .22s;
}
.scroll-to-top.visible{opacity:1;visibility:visible;transform:none}
.scroll-to-top:hover{background:#081d68;transform:translateY(-3px)}
.scroll-to-top:focus-visible{outline:3px solid rgba(255,104,28,.3);outline-offset:3px}
@media(max-width:620px){.scroll-to-top{right:15px;bottom:15px;width:44px;height:44px;font-size:23px}}
@media(prefers-reduced-motion:reduce){.scroll-to-top{transition:none}}