I got a store to do some updates, and so far so good. I did, etc ...
The problem is as follows. CSS modifications are only applied in the clients browser if they clear their browser history. If for example, they entered a week before in the site, and today, after the update I made, they enter again, the site will still have those CSS information the last time his site "downloaded my site" .
As the store is Magento, it has the options to clean cache, and also has the part of clearing CDN cache, but no use.
Is there anything in PHP or JavaScript that makes it delete this data from the client browser?