Css in HTML block Volto

I was trying to use HTML block in Volto. So I used some of semantic UI classes in my HTML, it did not render in the required way. Is it possible to apply CSS to HTML block in Volto?

I am using Plone 5.2.0 and Volto latest version.

The HTML block follows the restrictions of the regular Plone TinyMCE richtext field, so you need to configure style as "not nasty" tag in Plone classic @@filter-controlpanel

Thanks, that worked.

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