HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border-block-start-width Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .box {
      border-block-start-width: 5px;
      border-block-start-style: solid;
      border-block-start-color: black;
      padding: 1.25rem;
      background-color: #e2e8f0;
      max-width: 24rem;
    }
  </style>
</head>
<body>
  <h1>Block Element with Custom Border Block Start Width</h1>
  <div class="box">This block element has a 5px wide border on the block-start side.</div>
</body>
</html>

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CSS border-block-start-width Property - 5px Border