HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>first slide scroll-margin-left</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f1f5f9;
    }

    .track {
      display: flex;
      gap: 12px;
      width: 340px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      scroll-behavior: smooth;
      padding: 12px;
      border: 2px solid #94a3b8;
      border-radius: 12px;
      background: #fff;
    }

    .slide {
      flex: 0 0 160px;
      height: 120px;
      scroll-snap-align: start;
      border-radius: 10px;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #0f172a;
    }

    .slide:first-child {
      scroll-margin-left: 24px;
      background: #fde68a;
    }

    .slide:not(:first-child) {
      background: #bfdbfe;
    }
  </style>
</head>
<body>
  <h1>First snap slide</h1>
  <p>Scroll to the first slide. <code>scroll-margin-left: 24px</code> adds space on its left edge.</p>
  <div class="track">
    <div class="slide">One</div>
    <div class="slide">Two</div>
    <div class="slide">Three</div>
  </div>
</body>
</html>

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First slide left spacing