.back-to-top {
  --back-to-top-cookie-offset: 0px;
  position: fixed;
  z-index: 900;
  right: calc(20px + env(safe-area-inset-right));
  bottom: calc(20px + env(safe-area-inset-bottom) + var(--back-to-top-cookie-offset));
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid rgb(255 255 255 / 75%);
  border-radius: 50%;
  background: rgb(21 21 21 / 92%);
  color: #fff;
  box-shadow: 0 8px 24px rgb(0 0 0 / 18%);
  cursor: pointer;
  font: inherit;
  line-height: 1;
}

.back-to-top[hidden] {
  display: none;
}

.back-to-top:hover {
  background: var(--accent);
}

.back-to-top:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.back-to-top__icon {
  display: block;
  transform: translateY(-1px);
  font-size: 25px;
  font-weight: 800;
}

@media (max-width: 720px) {
  .back-to-top {
    right: calc(12px + env(safe-area-inset-right));
    bottom: calc(12px + env(safe-area-inset-bottom) + var(--back-to-top-cookie-offset));
    width: 48px;
    height: 48px;
  }
}