body {
  height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  font-family: cursive;
}

h1 {
  font-size: 70px;
  background: linear-gradient(
    90deg,
    #ff0080,
    #ff8c00,
    #40e0d0,
    #8a2be2,
    #ff0090
  );
  color: transparent;
  background-clip: text;
  background-size: 500% 500%;
  animation: gradient 6s ease infinite;
  text-align: center;
}

@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }

  100% {
    background-position: 0% 50%;
  }
}