HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS outline-width Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
    }
    button {
      padding: 0.75rem 1.25rem;
      border: 1px solid #cbd5e1;
      border-radius: 0.5rem;
      background: #fff;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      outline: solid black;
      outline-width: thick;
    }
  </style>
</head>
<body>
  <h1>Button with Custom Outline Width</h1>
  <button type="button">Click Me</button>
</body>
</html>

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CSS outline-width Property - thick Button