Rest Countries project with theme switch

Hey, I'm just dropping by to give some feedback: when I tried to set the filter to Asia and searched for United States of America, I still get results back. It should have been not found because the USA is not in Asia. This happens to other countries as well, just try to search for a country, then set a filter. You could fix the code responsible for filtering the data.

Also you can change the title of the HTML document to something like "REST Countries" and not "React App". Good work, keep it up!