Untitled

<!DOCTYPE html>
<html>
<head>
  <style>
    a {
      color: black;
      background: linear-gradient(90deg, red, orange, yellow, green, blue, purple);
      background-clip: text;
      -webkit-background-clip: text;
      font-size: 30px;
      transition: 500ms ease;
    }

    a:hover {
      color: transparent;
    }
  </style>
</head>
<body>
  <a href="#">Rainbow Link</a>
</body>
</html>
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