HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>scroll-margin-left longhand</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f8fafc;
    }

    .row {
      display: flex;
      gap: 12px;
      width: 340px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      scroll-behavior: smooth;
      padding: 10px;
      border: 2px solid #0f172a;
      border-radius: 12px;
      background: #fff;
    }

    .card {
      flex: 0 0 140px;
      height: 100px;
      scroll-snap-align: start;
      border-radius: 8px;
      display: grid;
      place-items: center;
      color: #fff;
      font-weight: 700;
    }

    #slide-left {
      scroll-margin-left: 3rem;
      background: #2563eb;
    }

    #slide-mid { background: #7c3aed; }
    #slide-end { background: #059669; }
  </style>
</head>
<body>
  <h1>Left offset on one slide</h1>
  <p>Only <code>#slide-left</code> uses <code>scroll-margin-left: 3rem</code>.</p>
  <div class="row">
    <div class="card" id="slide-left">Left</div>
    <div class="card" id="slide-mid">Middle</div>
    <div class="card" id="slide-end">End</div>
  </div>
</body>
</html>

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Left offset on one slide only