HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS border-block-width Same Width</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      background: #f8fafc;

    }

    .card {

      border-block-width: 4px;

      border-block-style: solid;

      border-block-color: #64748b;

      padding-block: 1rem;

      max-width: 22rem;

    }

  </style>

</head>

<body>

  <h1>Same width on both block sides</h1>

  <div class="card">4px borders on both block-start and block-end.</div>

</body>

</html>

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CSS border-block-width Property - Same Width on Both Sides