Add custom css to the Zzo theme

I’m having some trouble adding custom CSS to the Zzo theme. The theme apparently supports this, but following the instructions as specified in the theme’s documentation (https://zzodocs.netlify.app/docs/customization/customcss/) does not work. My changes are not taking effect. I even tried the specific example provided there (i.e. change the background color of #body), and that does not work either.

Any ideas on how to fix this?

Thanks.

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I will, thanks.