html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
}

.ghost {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.5);
  font-size: 20vw;
  opacity: 0;
  animation: boo 0.4s ease-out 3s forwards;
  user-select: none;
}

@keyframes boo {
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}