body {
  color: white;
  font-family: 'Horror';
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100vw;
  background: linear-gradient(0deg, #1a1a1a, #3b3b3b, #000000, #222222);
  background-size: 100% 400%; 
  animation: gradientMoveVertical 1s ease infinite;
  position: relative;
  overflow: hidden;
}
@keyframes gradientMoveVertical {
    0% { background-position: 50% 0%; }
    50% { background-position: 50% 100%; }
    100% { background-position: 50% 0%; }
}