HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border Side Shorthand</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .tabs {
      display: flex;
      gap: 1.25rem;
    }
    .tab {
      padding-bottom: 0.35rem;
      color: #64748b;
    }
    .tab.active {
      color: #0f172a;
      font-weight: 700;
      border-bottom: 3px solid #2563eb;
    }
  </style>
</head>
<body>
  <h1>Tab underline</h1>
  <nav class="tabs">
    <span class="tab">Home</span>
    <span class="tab active">Products</span>
    <span class="tab">Contact</span>
  </nav>
</body>
</html>

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CSS border Property - One Side Border