chromium/chrome/browser/resources/management/management.html

<!doctype html>
<html dir="$i18n{textdirection}" lang="$i18n{language}" class="loading">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, user-scalable=yes">
  <meta name="color-scheme" content="light dark">
  <title>$i18n{title}</title>

  <link rel="stylesheet" href="chrome://resources/css/md_colors.css">
  <link rel="stylesheet" href="chrome://resources/css/text_defaults_md.css">
  <style>
    html {
      height: 100%;
      overflow: hidden;
    }

    @media (prefers-color-scheme: dark) {
      html {
        background: var(--md-background-color);
      }
    }

    html.loading::before {
      border-bottom: var(--md-toolbar-border);
      box-sizing: border-box;
      content: '';
      display: block;
      height: var(--md-toolbar-height);
    }

    body {
      height: 100%;
      margin: 0;
    }
  </style>

  <script type="module" src="management_ui.js"></script>
</head>
<body>
  <management-ui></management-ui>
</body>
</html>