#popup {
  width: 100%;
  height: 0;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  opacity: 0;
  position: fixed;
  bottom: -300px;
  display: none;
  left: 0;
  transition: all 0.5s ease-in-out;
  z-index: 99999;
  background-color: rgba(255, 255, 255, 0.6);
  display: flex;
}
#popup.fade-in {
  height: 100vh;
  bottom: 0;
  visibility: visible;
  opacity: 1;
}
#popup .popup-inner {
  position: relative;
  border-radius: 5px;
  overflow: hidden;
}
#popup a.popup-close {
  position: absolute;
  top: 15px;
  right: 15px;
  width: 15px;
}