.totop {
  --btn-height: 64px;
  width: 80px;
  position: absolute;
  right: 88px;
  top: 692.5px;
  z-index: 3;
  /* Match the header lang toggle: .btn--glass's rgba(4,5,9,0.48) reads as
     near-solid black against the dark footer background. */
  background-color: rgba(0, 0, 0, 0.16);
}
.totop:hover {
  transform: scale(1.06);
}
.totop .btn__icon { transform: rotate(-90deg); }