Issue with changing font size in articles

Is there any ” way / CSS” code to control or maximize article body text and headlines? (Post/ pages only)
Because in Gutenberg its really difficult to change fond size in the article, as it’s only allowed to change a single block.

I found font change in the customizer but it changes all the font size of the whole website.

Thanks In advance

• This topic was modified 4 years, 6 months ago by Ruma Dey Baidya.
• This topic was modified 4 years, 6 months ago by Ruma Dey Baidya.