Intermediate CSS Resources/Practice

What is a good CSS resource for a backend engineer? I have done all the basic tutorials like W3Schools, Mozilla Docs, watched tons of youtube videos, but nothing clicked yet. I have tried to replicate websites but I get stuck halfway. Stack overflow is unhelpful as they want an "easily reproducible" code everytime. In practice it is not easy.

I think I need some "intermediate" level tutorials and explanations. I have seen tons of youtube videos, but the problem is that for finer things, it is mostly "draw rest of the owl".

Short of taking a full time job in frontend and learning on the job, are they any step by step resources to learn CSS at an intermediate level?