HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border-block Basic Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    div {
      border-block: 4px solid blue;
      padding: 1rem;
      max-width: 24rem;
    }
  </style>
</head>
<body>
  <h1>Border-Block Example</h1>
  <div>This element has a blue border on the block-start and block-end sides.</div>
</body>
</html>

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CSS border-block Property - Solid Blue Borders