.modal {
  display: block;
  position: fixed;
  background-color: rgba(0, 0, 0, 0.5);
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 999;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s;
}

.modal:target {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}

.modal > a {
  display: inline-block;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  cursor: default;
}

.modal > div {
  width: 400px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #ffffff;
}