#loading {
  position: fixed;
  align-items: center;
  display: flex;
  height: 100%;
  justify-content: center;
  width: 100%;
}

#loading img {
  animation: 1s ease-in-out 0s infinite alternate breathe;
  opacity: .66;
  transition: opacity .4s;
}

#loading.main_done img {
  opacity: 1;
}

@keyframes breathe {
  from {
    transform: scale(1)
  }

  to {
    transform: scale(0.95)
  }
}