HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS Grouped Button Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    button, .btn, input[type="submit"] {
      display: inline-block;
      padding: 0.5rem 1rem;
      background: #2563eb;
      color: #fff;
      border: none;
      border-radius: 0.4rem;
      font-weight: 600;
      cursor: pointer;
      font-size: 0.9375rem;
      margin-right: 0.5rem;
      margin-bottom: 0.5rem;
    }

    a.btn {
      text-decoration: none;
    }
  </style>
</head>
<body>
  <button type="button">Native button</button>
  <a class="btn" href="#">Link .btn</a>
  <input type="submit" value="Submit input">
</body>
</html>

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CSS Selector Grouping - Mixed Buttons