body {
  background: linear-gradient(
    to bottom,
    #000000 0%,
    #1f5b9b 45%,
    #e0bdf5 75%
  );
  background-size: 100% 150%;
  background-attachment: fixed;
  animation: gentleWaves 3s ease-in-out infinite;
}

@keyframes gentleWaves {
  0% {
    background-position: 50% 0%;
  }
  50% {
    background-position: 50% 30%;
  }
  100% {
    background-position: 50% 0%;
  }
}