I had no previous experience with Tailwind and thought it was “just” an update. Unfortunately, I was wrong.
After the update, nothing worked at first. A few Google searches later, I was able to fix the site so that it looked the same as before the update, but switching from dark to light theme still didn’t work.
It took me quite some nerve to get it working again. Now I am all the more relieved that I can move on to the next challenge.