Description: - Give the page a clean, cohesive, and aesthetic design using plain CSS. Tasks: - Define colors, fonts, and spacing. - Style the main layout. - Style the country card. - Style buttons, select elements, and favorites. - Add clear hover and focus styles. - Use only self-written plain CSS. Acceptance: - The page has a consistent visual expression. - No third-party UI components are used. - Tailwind or other CSS frameworks are not used. - Interactive elements have visible focus.