discourse/app/assets/stylesheets/desktop/post-action-menu.scss

@keyframes slide {
  0% {
  }
  100% {
    transform: translateY(100%) translateX(-50%);
    opacity: 0;
  }
}

.post-link-copied-alert {
  position: absolute;
  top: -1.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--success);
  padding: 0.25rem 0.5rem;
  white-space: nowrap;
  font-size: var(--font-down-2);
  opacity: 1;
  transition: opacity 0.5s ease-in-out;
  z-index: z("modal", "popover");
  &.-success {
    color: var(--success);
  }

  &.-fail {
    color: var(--danger);
  }

  &.slide-out {
    animation: slide 1s cubic-bezier(0, 0, 0, 2) forwards;
  }
}

@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}

.post-action-menu {
  &__copy-link {
    position: relative;
    height: 100%;

    &.is-copied,
    &.is-copied:hover {
      .d-icon-d-post-share {
        color: var(--success);
      }
    }
  }
  &__copy-link-checkmark {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 20px;
    height: 20px;
    display: block;
    stroke: #2ecc71;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;

    &.is-visible {
      opacity: 1;
    }

    path {
      stroke: var(--success);
      stroke-width: 4;
      stroke-dasharray: 100;
      stroke-dashoffset: 100;
      animation: draw 1s forwards;
    }
  }
}