form::after {
  --t: 0.5s;

  transition: transform var(--t), opacity var(--t);
  transform: translateY(100%);
  background: whitesmoke;
  content: 'Saving...';
  margin-top: 0.5rem;
  position: sticky;
  padding: 0.5rem;
  display: block;
  width: 100%;
  z-index: 10;
  opacity: 0;
  bottom: 0;
}

form.busy::after {
  transform: translateY(0%);
  opacity: 1;
}

.acf-form-submit {
  justify-content: space-between;
  display: flex;
}