H3 and <p> in a tab

I want to have an h3 and text in a tab styled differently. I have tried with a span for colour change, but if I edit the underlying code to add a class to a new paragraph tag for full control it does not get saved
Image 2022-04-28 at 3.53.12 pm
Any ideas how to achieve this.

Hi @Tony_Dawson, could you please share the website preview link?