Mobile-Friendliness?

I am playing around with Zoho Sites as we may start using them for landing pages. However, I can't find a way to make the site mobile-friendly. The font size seems to be set in the WYSIWYG editor and I am not able to change it even if I give the text a CSS class and add custom CSS.

Am I just missing something? This seems like a very necessary feature that I'd expect a platform like this to have, so I'm guessing I am missing something.

Thank you in advance for any insight!

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