.flip-card + .fc-close {
  opacity: 0;
  position: absolute;
  top: 0;
  right: 5px;
  margin: 10px;
  padding: 5px 6px;
  line-height: 1em;
}

.flip-card:hover + .fc-close {
  transition: opacity 250ms;
  transition-delay: 500ms;
  -webkit-transition: opacity 250ms;
  -webkit-transition-delay: 500ms;
  position: absolute;
  opacity: 1;
}

.flip-card:hover + .fc-close:focus {
  opacity: 0;
  transition: opacity 100ms;
  transition-delay: 0ms;
  -webkit-transition: opacity 100ms;
  -webkit-transition-delay: 0ms;
}

.mh-25vh {
    max-height: 25vh;
}