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-behavior on a container</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 24px;
      background: #f8fafc;
    }

    .sb-box {
      max-width: 360px;
      height: 220px;
      overflow-y: auto;
      scroll-behavior: smooth;
      border: 2px solid #cbd5e1;
      border-radius: 12px;
      background: #fff;
      padding: 12px;
    }

    .sb-box section {
      height: 160px;
      margin-bottom: 12px;
      border-radius: 8px;
      display: grid;
      place-items: center;
      font-weight: 700;
      color: #0f172a;
    }

    .sb-nav {
      display: flex;
      gap: 12px;
      margin-bottom: 12px;
    }

    .sb-nav a {
      color: #2563eb;
      font-weight: 600;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <h1>Container smooth scroll</h1>
  <div class="sb-nav">
    <a href="#panel-a">Panel A</a>
    <a href="#panel-b">Panel B</a>
    <a href="#panel-c">Panel C</a>
  </div>
  <div class="sb-box">
    <section id="panel-a" style="background:#fecaca;">Panel A</section>
    <section id="panel-b" style="background:#bfdbfe;">Panel B</section>
    <section id="panel-c" style="background:#bbf7d0;">Panel C</section>
  </div>
</body>
</html>

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Smooth scrolling inside a scrollable container