Create a React app to integrate with a "countries" REST API, and to fetch country data and display it like in the designs provided by frontendmentor.io.

• React Props
• Array.map
• React JSX
• Flexbox
• CSS

• Event handlers: onClick for buttons
• Event handlers: onChange for input fields and select elements
• useState: The React State hook
• useEffect: The React Effect hook, and how to use it with fetch
• Finnish Toggle Dark-Mode
• Make all images uniform