For future reference, these things happen because your browser caches often-used files locally on your computer for faster loading in the future. Usually, those files have a limited time-to-live, after which they expire and the browser fetches a new copy. The files responsible for styling the site (i.e. where elements in the page are placed, which colors they have, etc), are good candidates for caching as they don't change often.
In this case, after the update your browser was served new content that required new styling files to display properly. Because your browser had cached a now-outdated version of the styling files, things got messed up.
Whenever such things happen, all you have to do is a hard refresh of the page you're at (see my post above). That forces the browser to ignore the locally cached files and request new up-to-date ones, thus rendering everything correctly (hopefully). After this, your cache is up-to-date and you don't need to hard refresh again.