HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS Multiple Classes Example</title>
  <style>
    .btn {
      display: inline-block;
      padding: 0.5rem 1rem;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      background: #f8fafc;
      color: #334155;
      font-weight: 600;
      cursor: pointer;
      margin-right: 0.5rem;
    }

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

    .btn-large {
      padding: 0.65rem 1.25rem;
      font-size: 1.05rem;
    }
  </style>
</head>
<body>
  <button class="btn" type="button">Default</button>
  <button class="btn btn-primary" type="button">Primary</button>
  <button class="btn btn-primary btn-large" type="button">Large Primary</button>
</body>
</html>

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CSS .class Selector - Multiple Classes on One Element