Pomodoro Clock Project with React Hooks

Hello, ive finished My Pomodoro Clock Project

This is my first time using React Hooks and i learned on the go. This being said, i did not implement any advanced techniques to render more accurate clock intervals, nore this conventional setinterval technique , because i couldnt completely comprehend it. Instead i came up with my own, simple, not without flaws, but nonetheless working logic and it definitely was a trial, considering the React Hooks style.
I stuck to the functionality of the example project and did not do much modifications, only an appearance switch of day/night mode, which is something i havent done in the past.
What im mainly concerned is if people can find any crucial bugs that need addressing, but any contribution is welcome!