Hi @GarlandBriggs, could you please share the link to the the published site along with the read-only link: https://university.webflow.com/article/how-do-i-share-my-sites-read-only-link
As mentioned, it could be browser extensions, really hard to tell without a site link to look at, if you can help to provide a bit more info, it would be welcomed.
Also, if you are using any custom code on the site, like social plugins etc, those can also introduce third party css style sheets, that override the default styles created in Webflow.
Custom code and third party css styles are rendered only on the published site.
The !important is telling the page to use that style always for that class no matter what other style was loaded for the same class