HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>background-attachment: fixed</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 0;
      color: #0f172a;
    }

    .intro {
      margin: 16px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .panel {
      min-height: 180px;
      padding: 16px;
      color: #fff;
      font-weight: 700;
      background-image: repeating-linear-gradient(
        135deg,
        #1d4ed8 0 16px,
        #2563eb 16px 32px,
        #38bdf8 32px 48px
      );
      background-attachment: fixed;
    }

    .spacer {
      height: 70vh;
      padding: 16px;
      background: #f8fafc;
    }
  </style>
</head>
<body>
  <p class="intro">Scroll the page. With <strong>fixed</strong>, the stripes stay locked to the window while the panel moves. On many iPhones this may still act like scroll.</p>
  <div class="panel">fixed — scroll the page</div>
  <div class="spacer">Keep scrolling. The stripes should stay still on desktop browsers.</div>
</body>
</html>

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CSS background-attachment Property — fixed