HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border-block-end-width Units</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.25rem;
      background: #f8fafc;
      font-size: 16px;
    }
    .grid {
      display: grid;
      gap: 0.75rem;
      max-width: 16rem;
    }
    .px-border {
      border-block-end: 2px solid #2563eb;
      padding-block-end: 0.65rem;
    }
    .em-border {
      border-block-end-width: 0.25em;
      border-block-end-style: solid;
      border-block-end-color: #059669;
      padding-block-end: 0.65rem;
    }
    .rem-border {
      border-block-end: 0.5rem solid #7c3aed;
      padding-block-end: 0.65rem;
    }
  </style>
</head>
<body>
  <h1>Length units</h1>
  <div class="grid">
    <div class="px-border">2px</div>
    <div class="em-border">0.25em</div>
    <div class="rem-border">0.5rem</div>
  </div>
</body>
</html>

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CSS border-block-end-width Property - Length Units