HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS border-bottom Tab Underline</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-bottom Property - Active Tab Underline