Is there a way to crawl a site and find instances of CSS elements being used in the page?

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I’m a site owner – not a developer by any means. I’m cleaning up my “additional CSS” on the site I started out running, and I have a couple of elements in there that I’m not sure are still on the site, eg .wp-block-pullquote

Is there a way to crawl the site and find pages that have that element or others on the page without getting false positives from just the “additional CSS” part of the source?

I have Screaming Frog if that helps – I use that to grab things from pages already, eg publish dates.

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