HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>backgroundColor replacement</title>
  <style>
    body { margin: 0; font-family: system-ui, sans-serif; }
  </style>
</head>
<body>
  <p style="padding:1rem;color:#f8fafc">Modern dark background via body.style</p>
  <pre id="out" style="padding:1rem;color:#f8fafc"></pre>
  <script>
    document.body.style.backgroundColor = "#0f172a";
    document.getElementById("out").textContent = [
      "body.style.backgroundColor: " + document.body.style.backgroundColor,
      "(prefer CSS rules in stylesheets for new code)"
    ].join("\n");
  </script>
</body>
</html>

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Document.bgColor — CSS replacement (Try It)