.ddz-scroll-to-top {
  --ddz-st-bg: #ff4136;
  --ddz-st-fg: #ffffff;
  --ddz-st-shadow: 0 10px 30px rgba(0,0,0,.18);

  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 9999;

  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 999px;

  background: var(--ddz-st-bg);
  color: var(--ddz-st-fg);
  box-shadow: var(--ddz-st-shadow);

  display: inline-flex;
  align-items: center;
  justify-content: center;

  cursor: pointer;

  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease;
}

.ddz-scroll-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.ddz-scroll-to-top svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.ddz-scroll-to-top:focus-visible {
  outline: 3px solid rgba(255, 255, 255, .85);
  outline-offset: 2px;
}