If you’ve recently updated your theme to a newer version or made some changes to your website (Custom CSS) and they aren’t showing up, you probably have one of two caching problems:
Head to the plugin settings and press the big “Clear Cache” button. Refresh your site and you should see changes show up.
Some plugins like WP Super Cache include an option which once enabled will serve a non-cached version of your website to logged in users like you, the administrator, so make sure to look carefully in the settings page of your caching plugin if such an option is available:
Some hosting companies, like SiteGround, Bluehost, GoDaddy also provide site caching without installing a plugin, so make sure to check if there’s an option in the Dashboard to Clear/Purge the cache.
Here’s an example how it looks with SiteGround: