body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #111827;
  font-family: system-ui, sans-serif;
}

.rainbow-text {
  font-size: clamp(4rem, 14vw, 12rem);
  font-weight: 900;
  text-transform: uppercase;

  background: linear-gradient(
    90deg,
    #ff0080,
    #ff8c00,
    #40e0d0,
    #8a2be2,
    #ff0080
  );
  background-size: 300% 100%;

  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;

  animation: gradient-move 6s linear infinite;
}

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

  to {
    background-position: 300% 50%;
  }
}