.popup {
  animation-name: popup;
  animation-duration: 6s;
  animation-iteration-count: 1;
  position: fixed;
  bottom: 10px;
  text-align: center;
  animation-fill-mode: forwards;
}

@keyframes popup {
  0% {
    opacity: 100%;
  }

  33% {
    opacity: 100%;
  }

  100% {
    opacity: 0;
  }
}