#back-to-top {
  pointer-events: none;
  border: var(--back-to-top--border, var(--button--border));
  border-radius: var(--button--border-radius, var(--border-radius));
  height: 0;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  text-decoration: none;
  background: var(--back-to-top--background, var(--color--base-1));
  opacity: 0;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  transform: scale(0);
  transform-origin: center;
}

#back-to-top::before {
  position: relative;
  top: 1px;
  content: "\f077";
  font: var(--icon--font);
  color: var(--back-to-top--color, var(--color--contrast-1));
}

#back-to-top.visible {
  pointer-events: auto;
  height: var(--input--min-height);
  opacity: 1;
  transform: scale(1);
}