HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS [class^=btn-] Example</title>
  <style>
    [class^="btn-"] {
      display: inline-block;
      padding: 0.45rem 1rem;
      border-radius: 6px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      margin-right: 0.5rem;
    }

    .btn-primary {
      background: #2563eb;
      color: #fff;
    }

    .btn-danger {
      background: #dc2626;
      color: #fff;
    }

    .card {
      padding: 0.45rem 1rem;
      background: #e2e8f0;
      border-radius: 6px;
      display: inline-block;
    }
  </style>
</head>
<body>
  <h1>Buttons</h1>
  <button class="btn-primary">Save</button>
  <button class="btn-danger">Delete</button>
  <span class="card">Not a button</span>
</body>
</html>

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CSS [attribute^=value] - Class Prefix btn-