External main.css file stopped working after Pycharm re-activation

I'm building a website and up until yesterday all my external css files worked correctly.

Today when starting Pycharm I got a message that I needed to 'activate' it. I did, and went to my Project directory and continue to work but noticed that the .css file is not responding to any changes that I made. In fact it's literally freezed to where it was yesterday irregardless of any edits on it. Even when erasing everything in that .css file, it renders the same exact style.

Anyone have any similar experiences? I don't know what happened or what to do.