How to save css code to css file by panel?

Kirby 3 Solved ✅
5

I refer to this post
change $site to $newSite.
looks very good.

  'hooks' => [
    'site.update:after' => function ($newSite) {
      $css =  ':root {
  --primary-color: ' . $newSite->primaryColor()->value() . ';
  --secondry-color: ' . $newSite->secondryColor()->value() . ';
}';
      F::write(kirby()->root('assets') . '/css/custom.css', $css);
    }
  ],
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