HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>transition: property duration</title>
  <style>
    button {
      background: #2563eb;
      color: #fff;
      padding: 0.6rem 1.1rem;
      border: none;
      border-radius: 0.35rem;
      font-weight: 700;
      cursor: pointer;
      transition: background-color 0.4s ease;
    }

    button:hover,
    button:focus-visible {
      background: #dc2626;
    }
  </style>
</head>
<body>
  <button type="button">Hover me</button>
</body>
</html>

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CSS transition Property — color duration