Missing lecture in section "Styling Components"?

In the course “React 18 for Beginners”, section “Styling components”, the second video “Vanilla CSS” jumps over showing the modified version of the “App.tsx”, since the last coding lesson was “Showing an Alert”, and in “Vanilla CSS” there is already another code, as I’m still having the button and the alert. Is this done on purpose or am I missing a lecture?