No CSS and JS files after improved nginx.conf

I just did a fresh install on my Vultr server and used the improved nginx.conf and mime.type files. However, only html files are now loaded. For CSS and JS files the server gives a 404 error. What went wrong? you can see for yourself at

nginx.conf was last updated 3 months ago in the repo. Restoring the old one you used fixes the problem, to make sure the problem is caused by the new conf?

Ok you were right. It has nothing to do with nginx.conf but rather with Dropbox. I set the root html folder to ~/Dropbox/grav and that is why it is not working. Any idea why that is? I redownloaded grav into a different folder and that seems to be working without any problems.

chmod 775 fixed it