add solution

[dimon2202]

https://dimon2202.github.io/react_decompose/

[mateacademy-ai-mentor]

Review Summary

Your solution is approved because all core functional requirements are clearly met. You have split the UI into separate React components (Welcome, Header, Article, Navigation), each in its own folder with a default export, and App correctly imports and renders them. CSS is properly separated per component (Welcome.css, Header.css, Article.css, Navigation.css), and there are no syntax or structural issues in the JSX or styling that would break functionality. I don’t see any critical blockers such as missing features, runtime errors, or incorrect behavior.

The remaining points are procedural and non-blocking: make sure you run npm test locally and fix anything that might fail, keep Prettier/format-on-save enabled as requested, and double-check that all project files are committed to git. As a small polish improvement, you might either remove the unused opacity transition in Header.css or actually animate opacity, and consider adding a z-index to the sticky header so it always stays above page content. Overall, this is a clean, well-structured implementation of the task—nice work.

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