.rainbow-text {
    font-weight: bold;
    background: linear-gradient(
      90deg,
      red,
      orange,
      yellow,
      green,
      cyan,
      blue,
      violet,
      red
    );
    background-size: 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: rainbowColor 5s linear infinite;
  }
  
  @keyframes rainbowColor {
    0% { filter: hue-rotate(0deg); }
    100% { filter: hue-rotate(360deg); }
  }