body {
  background-image: url('https://spark-0f-hallways.neocities.org/octagonos/octagonum.png'), url('https://spark-0f-hallways.neocities.org/octagonos/gradium.png');
  background-size: cover, cover;
  background-position: center -50px, center;
  background-repeat: repeat, no-repeat;
  background-attachment: scroll, fixed;
  animation: move 4s ease-in-out infinite alternate;
  color: white;
  font-family: 'Verdana';
  font-size: 20px;
  text-align: center;
  text-shadow: 0 0 10px #000;
}

@keyframes move {
  0% {
    background-position: center -50px, center;
  }
  100% {
    background-position: center -100px, center;
  }
}