CSS is a relatively simple topic. I usually recommend learning it by ourselves and avoiding a course that covers it.
You can find detailed documentation for CSS (as well as many other web technologies) at https://developer.mozilla.org.
If you happen to know Hebrew, I strongly recommend checking out the video clips I created for learning CSS at https://www.youtube.com/playlist?list=PLXbb_VgMNspKeX095C4Sd1eDNHl0ehpsy.
I also recommend checking our asynchronous courses at https://academy.lifemichael.com. Please note that this website includes two separate websites. The first includes courses in Hebrew. The second includes courses in English.