#preloader {
  position: fixed;
  z-index: 1000;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  background-color: #fff;
  transition: opacity 0.3s;
}

#preloader.hidden {
  opacity: 0;
}

#preloader-sign {
  width: 72px;
  height: 72px;
  animation: sign 0.8s ease-in-out infinite alternate;
}

#preloader-wave {
  position: absolute;
  width: 72px;
  height: 72px;
  border: 1px solid #121429;
  border-radius: 36px;
  animation: wave 1.6s ease-in-out infinite;
}

@keyframes sign {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.4);
  }
}

@keyframes wave {
  from {
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.4);
  }
  to {
    transform: scale(2);
    opacity: 0;
  }
}