HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border Solid Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    div {
      border: 2px solid black;
      padding: 10px;
      max-width: 24rem;
    }
  </style>
</head>
<body>
  <h1>Div with Custom Border</h1>
  <div>This div element has a 2px solid black border.</div>
</body>
</html>

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CSS border Property - Solid Black Border