Injecting content just after the body tag when using filament

Can anyone point me to the correct location to adding a subtle modification the primary template used in Filament v3 - I ned to inject some custom content immediately after the body tag and am having trouble locating the template that used for this.

I looked at template resources/views/vendor/filament/components/layout/base.blade.php that I assumed would be the right one but my changes don't get reflected when testing.

Is there a more appropriate method I should follow for this perhaps on the panel provider?
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