[split] CodeIgniter 4.0.0 splash screen

My original reply, up above, *is* that page. When rendered, it produces the screen you show.
The controller that manages this is application/Controllers/Home, which renders the view in
application/Views/welcome_message. The CSS is embedded in that view page too.
And, yes, this is all in the CodeIgniter4 repository.
The information I cite above is actually contained in the rendered page too.
I am not sure how otherwise to answer your question.