Changing Font and Size

Hi to all,
I am trying to change the Font and Size of a paragraph using the “Design” Tab in wappler that should update the CSS to change the style.
In the code and “Style” Tab I see the updates happening but visually nothing changes !!

I can overwrite the code directly and force it to update the design but then I lose the bootstrap grid system !

Please help, I been stuck on this for days now and is driving me crazy
Thank you in advance for any reply.