Usually, some images are cached. My Yii app has some caching but not usually for CSS that I know of. I made the CSS changes and could see the changes take effect on my local development environment but not on live server. I attached two photos of development environment that has the black font and updated navigation bar and the live site that is CSS changes aren't taking effect with the black font and the navigation bar. All I know what to do is wait and hope that it's changes take effect. I'm running Apache PHP MySQL and am the developer but didn't install the server and don't know what settings are on it to make the changes.