HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border-block Two Values</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .panel {
      border-block-start: 3px solid #2563eb;
      border-block-end: 1px solid #cbd5e1;
      padding: 1rem;
      max-width: 22rem;
      background: #fff;
      border-radius: 0.5rem;
    }
  </style>
</head>
<body>
  <h1>Split block borders</h1>
  <div class="panel">Strong block-start border, subtle block-end border.</div>
</body>
</html>

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CSS border-block Property - Split Start and End Borders