.introContainer{ 
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #000;
  overflow: hidden;
  position: absolute;
  z-index: 999;
  animation: fadeOut 3.5s ease-in-out forwards;
}

.introContainer.hidden{
  display: none;
}

.mainContent{
  position: relative;
}

#intro-logo {
  animation: fadeOut 3s ease-in-out forwards;
}


#intro-logo img {
  width: 10rem;
  animation: glow 2.5s ease-in-out forwards; 
}

@keyframes glow {
  0%, 100% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
}

@keyframes fadeOut {
  0% {
    opacity: 1;
  }
  80% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    display: none;
  }
}