discourse/app/assets/stylesheets/mobile/post-action-feedback.scss

@keyframes d-toast-opening {
  from {
    transform: translateY(var(--transform-y, 10px));
  }
}

.post-action-feedback-alert {
  --transform-y: 0;

  position: fixed;
  top: calc(var(--header-offset) + 0.5rem);
  left: 0;
  right: 0;
  margin-inline: 0.5rem;
  z-index: z("max");
  display: flex;
  box-sizing: border-box;
  padding: 1em 1.5em;
  opacity: 1;
  transition: opacity 0.5s;
  border-radius: var(--d-border-radius);
  color: var(--primary);
  overflow: hidden;
  background-color: var(--tertiary-very-low);
  border: 1px solid var(--primary-low);
  box-shadow: var(--shadow-menu-panel);
  overflow-wrap: break-word;
  animation: d-toast-opening 0.3s ease-in-out;
  will-change: transform;

  &.-fade-out {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .post-action-feedback-alert {
    --transform-y: 2vh;
  }
}