HTML Code

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

    .carousel {
      display: flex;
      gap: 10px;
      width: 360px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      scroll-behavior: smooth;
      border: 2px solid #cbd5e1;
      border-radius: 12px;
      background: #fff;
      padding: 10px;
    }

    .panel {
      flex: 0 0 220px;
      height: 160px;
      scroll-snap-align: center;
      border-radius: 10px;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #0f172a;
    }

    .panel:first-child {
      scroll-margin-left: 2rem;
      background: #fecaca;
    }
  </style>
</head>
<body>
  <h1>Carousel opening panel</h1>
  <p>The first panel keeps left-side breathing room when snapped into view.</p>
  <div class="carousel">
    <div class="panel">Panel 1</div>
    <div class="panel" style="background:#bfdbfe;">Panel 2</div>
    <div class="panel" style="background:#bbf7d0;">Panel 3</div>
  </div>
</body>
</html>

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Carousel opening panel with left offset