HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>CSS Grid Layout</title>
  <style>*{box-sizing:border-box}body{font-family:system-ui,sans-serif;margin:0;padding:1rem;background:#f8fafc;color:#334155}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}.layout{display:grid;grid-template-columns:1fr 2fr;min-height:200px;gap:.5rem}.pane{padding:1rem;border-radius:8px;font-size:.875rem}.pane--nav{background:#e2e8f0;color:#334155}.pane--main{background:#eff6ff;border:1px solid #93c5fd;color:#1e3a8a}@media (max-width:480px){.layout{grid-template-columns:1fr}}</style>
</head>
<body>
  <h1>Modern Multi-Pane Layout</h1>
  <div class=layout>
    <nav class="pane pane--nav">Navigation</nav>
    <main class="pane pane--main">Main content — replaces framed layouts with CSS Grid.</main>
  </div>
</body>
</html>

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HTML noframes Tag — Modern CSS Grid Layout