@keyframes delayedHide {
  to {
    visibility: hidden;
    height: 0;
    padding: 0;
    margin-bottom: 0;
    opacity: 0;
  }
}

div.download_popup {
  min-width: 200px;
  max-width: 90vw;
  min-height: 70px;
  border: 1px solid green;
  background-color: #b5d199;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999999;
  text-align: center;
  border-radius: 5px;
  padding: 20px 30px;
  color: green;
  font-size: x-large;
  display: none;
  box-sizing: border-box;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
  line-height: 1.2;
}

div.download_popup.show {
  display: block;
  visibility: visible;
  animation: .3s forwards delayedHide;
  animation-delay: 2s;
}