/* Back To Top — fixed round button */
.ddb-back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 40;
  display: none;
  place-items: center;
  height: 2.75rem;
  width: 2.75rem;
  border: 0;
  border-radius: 9999px;
  background: var(--ddb-ink);
  color: #fff;
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  cursor: pointer;
  transition: background-color 0.2s;
}
.ddb-back-to-top.is-visible {
  display: grid;
}
.ddb-back-to-top:hover {
  background: oklch(0.22 0.13 265 / 0.85);
}