.container {
  background-color: #000; /* black background color */
  height: 160vh; /* adjust to your preference */
}

.logo {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%); /* center logo within container */
  opacity: 0;
  transition: opacity 3s ease-in-out;
}

.fade-in {
  opacity: 1;
}