message: fix(datetime): override dark mode in theming playground
diff: <script type="module" src="https://cdn.jsdelivr.net/npm/@ionic/core@6/dist/ionic/ionic.esm.js"></script>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@ionic/core@6/css/ionic.bundle.css" />
  <style>
  - :root {
  + :root,
  + .ios body.dark,
  + .md body.dark {
  --ion-color-rose: #831843;
  --ion-color-rose-rgb: 131,24,67;
  --ion-color-rose-contrast: #ffffff;
  