REST countries API [react, react router v6, redux, asyncThunks]

This is my first project where I work with external REST API resources. For this task I decided to use Redux'es createAsyncThunk because it gives you an opportunity to easily handle different states the application is in at the moment of hooking from external API. Working with React components again I found it quite disastrous to make styles for every component in a separate file and eventually I always got lost. So, I need to find any solution to alleviate my struggles during such projects. Any code review would be amazing. Thank you!