If anyone is having problems, please let me know the browser, browser version, and device you are using the site on. I can't really help without these details. Screenshots also very welcome.
If you cannot see the button, please do make sure to refresh your cache using a hard refresh or by clearing history as written in the OP.
Ctrl + shift + R works for most mac users and Ctrl + F5 for most Windows users will work, it will refresh the page but will redownload all content from the server (including new button styling) because your computer might have stored a cache of old code.